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linux-stable/net/batman-adv/netlink.c
Linus Lüssing bab93d5366 batman-adv: allow netlink usage in unprivileged containers 
[ Upstream commit 9057d6c23e ]

Currently, creating a batman-adv interface in an unprivileged LXD
container and attaching secondary interfaces to it with "ip" or "batctl"
works fine. However all batctl debug and configuration commands
fail:

  root@container:~# batctl originators
  Error received: Operation not permitted
  root@container:~# batctl orig_interval
  1000
  root@container:~# batctl orig_interval 2000
  root@container:~# batctl orig_interval
  1000

To fix this change the generic netlink permissions from GENL_ADMIN_PERM
to GENL_UNS_ADMIN_PERM. This way a batman-adv interface is fully
maintainable as root from within a user namespace, from an unprivileged
container.

All except one batman-adv netlink setting are per interface and do not
leak information or change settings from the host system and are
therefore save to retrieve or modify as root from within an unprivileged
container.

"batctl routing_algo" / BATADV_CMD_GET_ROUTING_ALGOS is the only
exception: It provides the batman-adv kernel module wide default routing
algorithm. However it is read-only from netlink and an unprivileged
container is still not allowed to modify
/sys/module/batman_adv/parameters/routing_algo. Instead it is advised to
use the newly introduced "batctl if create routing_algo RA_NAME" /
IFLA_BATADV_ALGO_NAME to set the routing algorithm on interface
creation, which already works fine in an unprivileged container.

Cc: Tycho Andersen <tycho@tycho.pizza>
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-01-27 11:04:25 +01:00

1518 lines
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Matthias Schiffer
*/
#include "netlink.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/cache.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/genetlink.h>
#include <linux/gfp.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/limits.h>
#include <linux/list.h>
#include <linux/minmax.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/printk.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <net/genetlink.h>
#include <net/net_namespace.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 "gateway_common.h"
#include "hard-interface.h"
#include "log.h"
#include "multicast.h"
#include "network-coding.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_CONFIG,
BATADV_NL_MCGRP_TPMETER,
};
/**
* enum batadv_genl_ops_flags - flags for genl_ops's internal_flags
*/
enum batadv_genl_ops_flags {
/**
* @BATADV_FLAG_NEED_MESH: request requires valid soft interface in
* attribute BATADV_ATTR_MESH_IFINDEX and expects a pointer to it to be
* saved in info->user_ptr[0]
*/
BATADV_FLAG_NEED_MESH = BIT(0),
/**
* @BATADV_FLAG_NEED_HARDIF: request requires valid hard interface in
* attribute BATADV_ATTR_HARD_IFINDEX and expects a pointer to it to be
* saved in info->user_ptr[1]
*/
BATADV_FLAG_NEED_HARDIF = BIT(1),
/**
* @BATADV_FLAG_NEED_VLAN: request requires valid vlan in
* attribute BATADV_ATTR_VLANID and expects a pointer to it to be
* saved in info->user_ptr[1]
*/
BATADV_FLAG_NEED_VLAN = BIT(2),
};
static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
[BATADV_NL_MCGRP_CONFIG] = { .name = BATADV_NL_MCAST_GROUP_CONFIG },
[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_ATTR_VLANID] = { .type = NLA_U16 },
[BATADV_ATTR_AGGREGATED_OGMS_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_AP_ISOLATION_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_ISOLATION_MARK] = { .type = NLA_U32 },
[BATADV_ATTR_ISOLATION_MASK] = { .type = NLA_U32 },
[BATADV_ATTR_BONDING_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_FRAGMENTATION_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_GW_BANDWIDTH_DOWN] = { .type = NLA_U32 },
[BATADV_ATTR_GW_BANDWIDTH_UP] = { .type = NLA_U32 },
[BATADV_ATTR_GW_MODE] = { .type = NLA_U8 },
[BATADV_ATTR_GW_SEL_CLASS] = { .type = NLA_U32 },
[BATADV_ATTR_HOP_PENALTY] = { .type = NLA_U8 },
[BATADV_ATTR_LOG_LEVEL] = { .type = NLA_U32 },
[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_MULTICAST_FANOUT] = { .type = NLA_U32 },
[BATADV_ATTR_NETWORK_CODING_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_ORIG_INTERVAL] = { .type = NLA_U32 },
[BATADV_ATTR_ELP_INTERVAL] = { .type = NLA_U32 },
[BATADV_ATTR_THROUGHPUT_OVERRIDE] = { .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_len(attr) == sizeof(u32)) ? nla_get_u32(attr) : 0;
}
/**
* batadv_netlink_mesh_fill_ap_isolation() - Add ap_isolation softif attribute
* @msg: Netlink message to dump into
* @bat_priv: the bat priv with all the soft interface information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_mesh_fill_ap_isolation(struct sk_buff *msg,
struct batadv_priv *bat_priv)
{
struct batadv_softif_vlan *vlan;
u8 ap_isolation;
vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
if (!vlan)
return 0;
ap_isolation = atomic_read(&vlan->ap_isolation);
batadv_softif_vlan_put(vlan);
return nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
!!ap_isolation);
}
/**
* batadv_netlink_set_mesh_ap_isolation() - Set ap_isolation from genl msg
* @attr: parsed BATADV_ATTR_AP_ISOLATION_ENABLED attribute
* @bat_priv: the bat priv with all the soft interface information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_set_mesh_ap_isolation(struct nlattr *attr,
struct batadv_priv *bat_priv)
{
struct batadv_softif_vlan *vlan;
vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);
if (!vlan)
return -ENOENT;
atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
batadv_softif_vlan_put(vlan);
return 0;
}
/**
* batadv_netlink_mesh_fill() - Fill message with mesh attributes
* @msg: Netlink message to dump into
* @bat_priv: the bat priv with all the soft interface information
* @cmd: type of message to generate
* @portid: Port making netlink request
* @seq: sequence number for message
* @flags: Additional flags for message
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_mesh_fill(struct sk_buff *msg,
struct batadv_priv *bat_priv,
enum batadv_nl_commands cmd,
u32 portid, u32 seq, int flags)
{
struct net_device *soft_iface = bat_priv->soft_iface;
struct batadv_hard_iface *primary_if = NULL;
struct net_device *hard_iface;
void *hdr;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
if (!hdr)
return -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 nla_put_failure;
#ifdef CONFIG_BATMAN_ADV_BLA
if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
ntohs(bat_priv->bla.claim_dest.group)))
goto nla_put_failure;
#endif
if (batadv_mcast_mesh_info_put(msg, bat_priv))
goto nla_put_failure;
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 nla_put_failure;
}
if (nla_put_u8(msg, BATADV_ATTR_AGGREGATED_OGMS_ENABLED,
!!atomic_read(&bat_priv->aggregated_ogms)))
goto nla_put_failure;
if (batadv_netlink_mesh_fill_ap_isolation(msg, bat_priv))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MARK,
bat_priv->isolation_mark))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_ISOLATION_MASK,
bat_priv->isolation_mark_mask))
goto nla_put_failure;
if (nla_put_u8(msg, BATADV_ATTR_BONDING_ENABLED,
!!atomic_read(&bat_priv->bonding)))
goto nla_put_failure;
#ifdef CONFIG_BATMAN_ADV_BLA
if (nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED,
!!atomic_read(&bat_priv->bridge_loop_avoidance)))
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_BLA */
#ifdef CONFIG_BATMAN_ADV_DAT
if (nla_put_u8(msg, BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED,
!!atomic_read(&bat_priv->distributed_arp_table)))
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_DAT */
if (nla_put_u8(msg, BATADV_ATTR_FRAGMENTATION_ENABLED,
!!atomic_read(&bat_priv->fragmentation)))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN,
atomic_read(&bat_priv->gw.bandwidth_down)))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP,
atomic_read(&bat_priv->gw.bandwidth_up)))
goto nla_put_failure;
if (nla_put_u8(msg, BATADV_ATTR_GW_MODE,
atomic_read(&bat_priv->gw.mode)))
goto nla_put_failure;
if (bat_priv->algo_ops->gw.get_best_gw_node &&
bat_priv->algo_ops->gw.is_eligible) {
/* GW selection class is not available if the routing algorithm
* in use does not implement the GW API
*/
if (nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS,
atomic_read(&bat_priv->gw.sel_class)))
goto nla_put_failure;
}
if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
atomic_read(&bat_priv->hop_penalty)))
goto nla_put_failure;
#ifdef CONFIG_BATMAN_ADV_DEBUG
if (nla_put_u32(msg, BATADV_ATTR_LOG_LEVEL,
atomic_read(&bat_priv->log_level)))
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_DEBUG */
#ifdef CONFIG_BATMAN_ADV_MCAST
if (nla_put_u8(msg, BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED,
!atomic_read(&bat_priv->multicast_mode)))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_MULTICAST_FANOUT,
atomic_read(&bat_priv->multicast_fanout)))
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_MCAST */
#ifdef CONFIG_BATMAN_ADV_NC
if (nla_put_u8(msg, BATADV_ATTR_NETWORK_CODING_ENABLED,
!!atomic_read(&bat_priv->network_coding)))
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_NC */
if (nla_put_u32(msg, BATADV_ATTR_ORIG_INTERVAL,
atomic_read(&bat_priv->orig_interval)))
goto nla_put_failure;
batadv_hardif_put(primary_if);
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
batadv_hardif_put(primary_if);
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_netlink_notify_mesh() - send softif attributes to listener
* @bat_priv: the bat priv with all the soft interface information
*
* Return: 0 on success, < 0 on error
*/
int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv)
{
struct sk_buff *msg;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_SET_MESH,
0, 0, 0);
if (ret < 0) {
nlmsg_free(msg);
return ret;
}
genlmsg_multicast_netns(&batadv_netlink_family,
dev_net(bat_priv->soft_iface), msg, 0,
BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
return 0;
}
/**
* batadv_netlink_get_mesh() - Get softif attributes
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_get_mesh(struct sk_buff *skb, struct genl_info *info)
{
struct batadv_priv *bat_priv = info->user_ptr[0];
struct sk_buff *msg;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = batadv_netlink_mesh_fill(msg, bat_priv, BATADV_CMD_GET_MESH,
info->snd_portid, info->snd_seq, 0);
if (ret < 0) {
nlmsg_free(msg);
return ret;
}
ret = genlmsg_reply(msg, info);
return ret;
}
/**
* batadv_netlink_set_mesh() - Set softif attributes
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
{
struct batadv_priv *bat_priv = info->user_ptr[0];
struct nlattr *attr;
if (info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED]) {
attr = info->attrs[BATADV_ATTR_AGGREGATED_OGMS_ENABLED];
atomic_set(&bat_priv->aggregated_ogms, !!nla_get_u8(attr));
}
if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
batadv_netlink_set_mesh_ap_isolation(attr, bat_priv);
}
if (info->attrs[BATADV_ATTR_ISOLATION_MARK]) {
attr = info->attrs[BATADV_ATTR_ISOLATION_MARK];
bat_priv->isolation_mark = nla_get_u32(attr);
}
if (info->attrs[BATADV_ATTR_ISOLATION_MASK]) {
attr = info->attrs[BATADV_ATTR_ISOLATION_MASK];
bat_priv->isolation_mark_mask = nla_get_u32(attr);
}
if (info->attrs[BATADV_ATTR_BONDING_ENABLED]) {
attr = info->attrs[BATADV_ATTR_BONDING_ENABLED];
atomic_set(&bat_priv->bonding, !!nla_get_u8(attr));
}
#ifdef CONFIG_BATMAN_ADV_BLA
if (info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED]) {
attr = info->attrs[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED];
atomic_set(&bat_priv->bridge_loop_avoidance,
!!nla_get_u8(attr));
batadv_bla_status_update(bat_priv->soft_iface);
}
#endif /* CONFIG_BATMAN_ADV_BLA */
#ifdef CONFIG_BATMAN_ADV_DAT
if (info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED]) {
attr = info->attrs[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED];
atomic_set(&bat_priv->distributed_arp_table,
!!nla_get_u8(attr));
batadv_dat_status_update(bat_priv->soft_iface);
}
#endif /* CONFIG_BATMAN_ADV_DAT */
if (info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED]) {
attr = info->attrs[BATADV_ATTR_FRAGMENTATION_ENABLED];
atomic_set(&bat_priv->fragmentation, !!nla_get_u8(attr));
batadv_update_min_mtu(bat_priv->soft_iface);
}
if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]) {
attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN];
atomic_set(&bat_priv->gw.bandwidth_down, nla_get_u32(attr));
batadv_gw_tvlv_container_update(bat_priv);
}
if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]) {
attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP];
atomic_set(&bat_priv->gw.bandwidth_up, nla_get_u32(attr));
batadv_gw_tvlv_container_update(bat_priv);
}
if (info->attrs[BATADV_ATTR_GW_MODE]) {
u8 gw_mode;
attr = info->attrs[BATADV_ATTR_GW_MODE];
gw_mode = nla_get_u8(attr);
if (gw_mode <= BATADV_GW_MODE_SERVER) {
/* Invoking batadv_gw_reselect() is not enough to really
* de-select the current GW. It will only instruct the
* gateway client code to perform a re-election the next
* time that this is needed.
*
* When gw client mode is being switched off the current
* GW must be de-selected explicitly otherwise no GW_ADD
* uevent is thrown on client mode re-activation. This
* is operation is performed in
* batadv_gw_check_client_stop().
*/
batadv_gw_reselect(bat_priv);
/* always call batadv_gw_check_client_stop() before
* changing the gateway state
*/
batadv_gw_check_client_stop(bat_priv);
atomic_set(&bat_priv->gw.mode, gw_mode);
batadv_gw_tvlv_container_update(bat_priv);
}
}
if (info->attrs[BATADV_ATTR_GW_SEL_CLASS] &&
bat_priv->algo_ops->gw.get_best_gw_node &&
bat_priv->algo_ops->gw.is_eligible) {
/* setting the GW selection class is allowed only if the routing
* algorithm in use implements the GW API
*/
u32 sel_class_max = 0xffffffffu;
u32 sel_class;
attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS];
sel_class = nla_get_u32(attr);
if (!bat_priv->algo_ops->gw.store_sel_class)
sel_class_max = BATADV_TQ_MAX_VALUE;
if (sel_class >= 1 && sel_class <= sel_class_max) {
atomic_set(&bat_priv->gw.sel_class, sel_class);
batadv_gw_reselect(bat_priv);
}
}
if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr));
}
#ifdef CONFIG_BATMAN_ADV_DEBUG
if (info->attrs[BATADV_ATTR_LOG_LEVEL]) {
attr = info->attrs[BATADV_ATTR_LOG_LEVEL];
atomic_set(&bat_priv->log_level,
nla_get_u32(attr) & BATADV_DBG_ALL);
}
#endif /* CONFIG_BATMAN_ADV_DEBUG */
#ifdef CONFIG_BATMAN_ADV_MCAST
if (info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED]) {
attr = info->attrs[BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED];
atomic_set(&bat_priv->multicast_mode, !nla_get_u8(attr));
}
if (info->attrs[BATADV_ATTR_MULTICAST_FANOUT]) {
attr = info->attrs[BATADV_ATTR_MULTICAST_FANOUT];
atomic_set(&bat_priv->multicast_fanout, nla_get_u32(attr));
}
#endif /* CONFIG_BATMAN_ADV_MCAST */
#ifdef CONFIG_BATMAN_ADV_NC
if (info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]) {
attr = info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED];
atomic_set(&bat_priv->network_coding, !!nla_get_u8(attr));
batadv_nc_status_update(bat_priv->soft_iface);
}
#endif /* CONFIG_BATMAN_ADV_NC */
if (info->attrs[BATADV_ATTR_ORIG_INTERVAL]) {
u32 orig_interval;
attr = info->attrs[BATADV_ATTR_ORIG_INTERVAL];
orig_interval = nla_get_u32(attr);
orig_interval = min_t(u32, orig_interval, INT_MAX);
orig_interval = max_t(u32, orig_interval, 2 * BATADV_JITTER);
atomic_set(&bat_priv->orig_interval, orig_interval);
}
batadv_netlink_notify_mesh(bat_priv);
return 0;
}
/**
* 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 of 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 batadv_priv *bat_priv = info->user_ptr[0];
struct sk_buff *msg = NULL;
u32 test_length;
void *msg_head;
u32 cookie;
u8 *dst;
int ret;
if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
return -EINVAL;
if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
return -EINVAL;
dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
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;
}
batadv_tp_start(bat_priv, dst, test_length, &cookie);
ret = batadv_netlink_tp_meter_put(msg, cookie);
out:
if (ret) {
if (msg)
nlmsg_free(msg);
return ret;
}
genlmsg_end(msg, msg_head);
return genlmsg_reply(msg, info);
}
/**
* batadv_netlink_tp_meter_cancel() - 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 batadv_priv *bat_priv = info->user_ptr[0];
u8 *dst;
int ret = 0;
if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
return -EINVAL;
dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
return ret;
}
/**
* batadv_netlink_hardif_fill() - Fill message with hardif attributes
* @msg: Netlink message to dump into
* @bat_priv: the bat priv with all the soft interface information
* @hard_iface: hard interface which was modified
* @cmd: type of message to generate
* @portid: Port making netlink request
* @seq: sequence number for message
* @flags: Additional flags for message
* @cb: Control block containing additional options
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_hardif_fill(struct sk_buff *msg,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *hard_iface,
enum batadv_nl_commands cmd,
u32 portid, u32 seq, int flags,
struct netlink_callback *cb)
{
struct net_device *net_dev = hard_iface->net_dev;
void *hdr;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
if (!hdr)
return -ENOBUFS;
if (cb)
genl_dump_check_consistent(cb, hdr);
if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
bat_priv->soft_iface->ifindex))
goto nla_put_failure;
if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
bat_priv->soft_iface->name))
goto nla_put_failure;
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;
}
if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY,
atomic_read(&hard_iface->hop_penalty)))
goto nla_put_failure;
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
if (nla_put_u32(msg, BATADV_ATTR_ELP_INTERVAL,
atomic_read(&hard_iface->bat_v.elp_interval)))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_THROUGHPUT_OVERRIDE,
atomic_read(&hard_iface->bat_v.throughput_override)))
goto nla_put_failure;
#endif /* CONFIG_BATMAN_ADV_BATMAN_V */
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_netlink_notify_hardif() - send hardif attributes to listener
* @bat_priv: the bat priv with all the soft interface information
* @hard_iface: hard interface which was modified
*
* Return: 0 on success, < 0 on error
*/
int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
struct batadv_hard_iface *hard_iface)
{
struct sk_buff *msg;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
BATADV_CMD_SET_HARDIF, 0, 0, 0, NULL);
if (ret < 0) {
nlmsg_free(msg);
return ret;
}
genlmsg_multicast_netns(&batadv_netlink_family,
dev_net(bat_priv->soft_iface), msg, 0,
BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
return 0;
}
/**
* batadv_netlink_get_hardif() - Get hardif attributes
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_get_hardif(struct sk_buff *skb,
struct genl_info *info)
{
struct batadv_hard_iface *hard_iface = info->user_ptr[1];
struct batadv_priv *bat_priv = info->user_ptr[0];
struct sk_buff *msg;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
BATADV_CMD_GET_HARDIF,
info->snd_portid, info->snd_seq, 0,
NULL);
if (ret < 0) {
nlmsg_free(msg);
return ret;
}
ret = genlmsg_reply(msg, info);
return ret;
}
/**
* batadv_netlink_set_hardif() - Set hardif attributes
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_set_hardif(struct sk_buff *skb,
struct genl_info *info)
{
struct batadv_hard_iface *hard_iface = info->user_ptr[1];
struct batadv_priv *bat_priv = info->user_ptr[0];
struct nlattr *attr;
if (info->attrs[BATADV_ATTR_HOP_PENALTY]) {
attr = info->attrs[BATADV_ATTR_HOP_PENALTY];
atomic_set(&hard_iface->hop_penalty, nla_get_u8(attr));
}
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
if (info->attrs[BATADV_ATTR_ELP_INTERVAL]) {
attr = info->attrs[BATADV_ATTR_ELP_INTERVAL];
atomic_set(&hard_iface->bat_v.elp_interval, nla_get_u32(attr));
}
if (info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE]) {
attr = info->attrs[BATADV_ATTR_THROUGHPUT_OVERRIDE];
atomic_set(&hard_iface->bat_v.throughput_override,
nla_get_u32(attr));
}
#endif /* CONFIG_BATMAN_ADV_BATMAN_V */
batadv_netlink_notify_hardif(bat_priv, hard_iface);
return 0;
}
/**
* batadv_netlink_dump_hardif() - 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_hardif(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;
struct batadv_priv *bat_priv;
int ifindex;
int portid = NETLINK_CB(cb->skb).portid;
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;
}
bat_priv = netdev_priv(soft_iface);
rtnl_lock();
cb->seq = batadv_hardif_generation << 1 | 1;
list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->soft_iface != soft_iface)
continue;
if (i++ < skip)
continue;
if (batadv_netlink_hardif_fill(msg, bat_priv, hard_iface,
BATADV_CMD_GET_HARDIF,
portid, cb->nlh->nlmsg_seq,
NLM_F_MULTI, cb)) {
i--;
break;
}
}
rtnl_unlock();
dev_put(soft_iface);
cb->args[0] = i;
return msg->len;
}
/**
* batadv_netlink_vlan_fill() - Fill message with vlan attributes
* @msg: Netlink message to dump into
* @bat_priv: the bat priv with all the soft interface information
* @vlan: vlan which was modified
* @cmd: type of message to generate
* @portid: Port making netlink request
* @seq: sequence number for message
* @flags: Additional flags for message
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_vlan_fill(struct sk_buff *msg,
struct batadv_priv *bat_priv,
struct batadv_softif_vlan *vlan,
enum batadv_nl_commands cmd,
u32 portid, u32 seq, int flags)
{
void *hdr;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, flags, cmd);
if (!hdr)
return -ENOBUFS;
if (nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX,
bat_priv->soft_iface->ifindex))
goto nla_put_failure;
if (nla_put_string(msg, BATADV_ATTR_MESH_IFNAME,
bat_priv->soft_iface->name))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_VLANID, vlan->vid & VLAN_VID_MASK))
goto nla_put_failure;
if (nla_put_u8(msg, BATADV_ATTR_AP_ISOLATION_ENABLED,
!!atomic_read(&vlan->ap_isolation)))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_netlink_notify_vlan() - send vlan attributes to listener
* @bat_priv: the bat priv with all the soft interface information
* @vlan: vlan which was modified
*
* Return: 0 on success, < 0 on error
*/
int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
struct batadv_softif_vlan *vlan)
{
struct sk_buff *msg;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan,
BATADV_CMD_SET_VLAN, 0, 0, 0);
if (ret < 0) {
nlmsg_free(msg);
return ret;
}
genlmsg_multicast_netns(&batadv_netlink_family,
dev_net(bat_priv->soft_iface), msg, 0,
BATADV_NL_MCGRP_CONFIG, GFP_KERNEL);
return 0;
}
/**
* batadv_netlink_get_vlan() - Get vlan attributes
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_get_vlan(struct sk_buff *skb, struct genl_info *info)
{
struct batadv_softif_vlan *vlan = info->user_ptr[1];
struct batadv_priv *bat_priv = info->user_ptr[0];
struct sk_buff *msg;
int ret;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
ret = batadv_netlink_vlan_fill(msg, bat_priv, vlan, BATADV_CMD_GET_VLAN,
info->snd_portid, info->snd_seq, 0);
if (ret < 0) {
nlmsg_free(msg);
return ret;
}
ret = genlmsg_reply(msg, info);
return ret;
}
/**
* batadv_netlink_set_vlan() - Get vlan attributes
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_netlink_set_vlan(struct sk_buff *skb, struct genl_info *info)
{
struct batadv_softif_vlan *vlan = info->user_ptr[1];
struct batadv_priv *bat_priv = info->user_ptr[0];
struct nlattr *attr;
if (info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED]) {
attr = info->attrs[BATADV_ATTR_AP_ISOLATION_ENABLED];
atomic_set(&vlan->ap_isolation, !!nla_get_u8(attr));
}
batadv_netlink_notify_vlan(bat_priv, vlan);
return 0;
}
/**
* batadv_get_softif_from_info() - Retrieve soft interface from genl attributes
* @net: the applicable net namespace
* @info: receiver information
*
* Return: Pointer to soft interface (with increased refcnt) on success, error
* pointer on error
*/
static struct net_device *
batadv_get_softif_from_info(struct net *net, struct genl_info *info)
{
struct net_device *soft_iface;
int ifindex;
if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
return ERR_PTR(-EINVAL);
ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface)
return ERR_PTR(-ENODEV);
if (!batadv_softif_is_valid(soft_iface))
goto err_put_softif;
return soft_iface;
err_put_softif:
dev_put(soft_iface);
return ERR_PTR(-EINVAL);
}
/**
* batadv_get_hardif_from_info() - Retrieve hardif from genl attributes
* @bat_priv: the bat priv with all the soft interface information
* @net: the applicable net namespace
* @info: receiver information
*
* Return: Pointer to hard interface (with increased refcnt) on success, error
* pointer on error
*/
static struct batadv_hard_iface *
batadv_get_hardif_from_info(struct batadv_priv *bat_priv, struct net *net,
struct genl_info *info)
{
struct batadv_hard_iface *hard_iface;
struct net_device *hard_dev;
unsigned int hardif_index;
if (!info->attrs[BATADV_ATTR_HARD_IFINDEX])
return ERR_PTR(-EINVAL);
hardif_index = nla_get_u32(info->attrs[BATADV_ATTR_HARD_IFINDEX]);
hard_dev = dev_get_by_index(net, hardif_index);
if (!hard_dev)
return ERR_PTR(-ENODEV);
hard_iface = batadv_hardif_get_by_netdev(hard_dev);
if (!hard_iface)
goto err_put_harddev;
if (hard_iface->soft_iface != bat_priv->soft_iface)
goto err_put_hardif;
/* hard_dev is referenced by hard_iface and not needed here */
dev_put(hard_dev);
return hard_iface;
err_put_hardif:
batadv_hardif_put(hard_iface);
err_put_harddev:
dev_put(hard_dev);
return ERR_PTR(-EINVAL);
}
/**
* batadv_get_vlan_from_info() - Retrieve vlan from genl attributes
* @bat_priv: the bat priv with all the soft interface information
* @net: the applicable net namespace
* @info: receiver information
*
* Return: Pointer to vlan on success (with increased refcnt), error pointer
* on error
*/
static struct batadv_softif_vlan *
batadv_get_vlan_from_info(struct batadv_priv *bat_priv, struct net *net,
struct genl_info *info)
{
struct batadv_softif_vlan *vlan;
u16 vid;
if (!info->attrs[BATADV_ATTR_VLANID])
return ERR_PTR(-EINVAL);
vid = nla_get_u16(info->attrs[BATADV_ATTR_VLANID]);
vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);
if (!vlan)
return ERR_PTR(-ENOENT);
return vlan;
}
/**
* batadv_pre_doit() - Prepare batman-adv genl doit request
* @ops: requested netlink operation
* @skb: Netlink message with request data
* @info: receiver information
*
* Return: 0 on success or negative error number in case of failure
*/
static int batadv_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info)
{
struct net *net = genl_info_net(info);
struct batadv_hard_iface *hard_iface;
struct batadv_priv *bat_priv = NULL;
struct batadv_softif_vlan *vlan;
struct net_device *soft_iface;
u8 user_ptr1_flags;
u8 mesh_dep_flags;
int ret;
user_ptr1_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
if (WARN_ON(hweight8(ops->internal_flags & user_ptr1_flags) > 1))
return -EINVAL;
mesh_dep_flags = BATADV_FLAG_NEED_HARDIF | BATADV_FLAG_NEED_VLAN;
if (WARN_ON((ops->internal_flags & mesh_dep_flags) &&
(~ops->internal_flags & BATADV_FLAG_NEED_MESH)))
return -EINVAL;
if (ops->internal_flags & BATADV_FLAG_NEED_MESH) {
soft_iface = batadv_get_softif_from_info(net, info);
if (IS_ERR(soft_iface))
return PTR_ERR(soft_iface);
bat_priv = netdev_priv(soft_iface);
info->user_ptr[0] = bat_priv;
}
if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF) {
hard_iface = batadv_get_hardif_from_info(bat_priv, net, info);
if (IS_ERR(hard_iface)) {
ret = PTR_ERR(hard_iface);
goto err_put_softif;
}
info->user_ptr[1] = hard_iface;
}
if (ops->internal_flags & BATADV_FLAG_NEED_VLAN) {
vlan = batadv_get_vlan_from_info(bat_priv, net, info);
if (IS_ERR(vlan)) {
ret = PTR_ERR(vlan);
goto err_put_softif;
}
info->user_ptr[1] = vlan;
}
return 0;
err_put_softif:
if (bat_priv)
dev_put(bat_priv->soft_iface);
return ret;
}
/**
* batadv_post_doit() - End batman-adv genl doit request
* @ops: requested netlink operation
* @skb: Netlink message with request data
* @info: receiver information
*/
static void batadv_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info)
{
struct batadv_hard_iface *hard_iface;
struct batadv_softif_vlan *vlan;
struct batadv_priv *bat_priv;
if (ops->internal_flags & BATADV_FLAG_NEED_HARDIF &&
info->user_ptr[1]) {
hard_iface = info->user_ptr[1];
batadv_hardif_put(hard_iface);
}
if (ops->internal_flags & BATADV_FLAG_NEED_VLAN && info->user_ptr[1]) {
vlan = info->user_ptr[1];
batadv_softif_vlan_put(vlan);
}
if (ops->internal_flags & BATADV_FLAG_NEED_MESH && info->user_ptr[0]) {
bat_priv = info->user_ptr[0];
dev_put(bat_priv->soft_iface);
}
}
static const struct genl_small_ops batadv_netlink_ops[] = {
{
.cmd = BATADV_CMD_GET_MESH,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
/* can be retrieved by unprivileged users */
.doit = batadv_netlink_get_mesh,
.internal_flags = BATADV_FLAG_NEED_MESH,
},
{
.cmd = BATADV_CMD_TP_METER,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.doit = batadv_netlink_tp_meter_start,
.internal_flags = BATADV_FLAG_NEED_MESH,
},
{
.cmd = BATADV_CMD_TP_METER_CANCEL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.doit = batadv_netlink_tp_meter_cancel,
.internal_flags = BATADV_FLAG_NEED_MESH,
},
{
.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_algo_dump,
},
{
.cmd = BATADV_CMD_GET_HARDIF,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
/* can be retrieved by unprivileged users */
.dumpit = batadv_netlink_dump_hardif,
.doit = batadv_netlink_get_hardif,
.internal_flags = BATADV_FLAG_NEED_MESH |
BATADV_FLAG_NEED_HARDIF,
},
{
.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_tt_local_dump,
},
{
.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_tt_global_dump,
},
{
.cmd = BATADV_CMD_GET_ORIGINATORS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_orig_dump,
},
{
.cmd = BATADV_CMD_GET_NEIGHBORS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_hardif_neigh_dump,
},
{
.cmd = BATADV_CMD_GET_GATEWAYS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_gw_dump,
},
{
.cmd = BATADV_CMD_GET_BLA_CLAIM,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_bla_claim_dump,
},
{
.cmd = BATADV_CMD_GET_BLA_BACKBONE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_bla_backbone_dump,
},
{
.cmd = BATADV_CMD_GET_DAT_CACHE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_dat_cache_dump,
},
{
.cmd = BATADV_CMD_GET_MCAST_FLAGS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.dumpit = batadv_mcast_flags_dump,
},
{
.cmd = BATADV_CMD_SET_MESH,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.doit = batadv_netlink_set_mesh,
.internal_flags = BATADV_FLAG_NEED_MESH,
},
{
.cmd = BATADV_CMD_SET_HARDIF,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.doit = batadv_netlink_set_hardif,
.internal_flags = BATADV_FLAG_NEED_MESH |
BATADV_FLAG_NEED_HARDIF,
},
{
.cmd = BATADV_CMD_GET_VLAN,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
/* can be retrieved by unprivileged users */
.doit = batadv_netlink_get_vlan,
.internal_flags = BATADV_FLAG_NEED_MESH |
BATADV_FLAG_NEED_VLAN,
},
{
.cmd = BATADV_CMD_SET_VLAN,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM,
.doit = batadv_netlink_set_vlan,
.internal_flags = BATADV_FLAG_NEED_MESH |
BATADV_FLAG_NEED_VLAN,
},
};
struct genl_family batadv_netlink_family __ro_after_init = {
.hdrsize = 0,
.name = BATADV_NL_NAME,
.version = 1,
.maxattr = BATADV_ATTR_MAX,
.policy = batadv_netlink_policy,
.netnsok = true,
.pre_doit = batadv_pre_doit,
.post_doit = batadv_post_doit,
.module = THIS_MODULE,
.small_ops = batadv_netlink_ops,
.n_small_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);
}
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