![Sven Eckelmann](/assets/img/avatar_default.png)
The header file is used by different userspace programs to inject packets or to decode sniffed packets. It should therefore be available to them as userspace header. Also other components in the kernel (like the flow dissector) require access to the packet definitions to be able to decode ETH_P_BATMAN ethernet packets. Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com> Signed-off-by: David S. Miller <davem@davemloft.net>
642 lines
16 KiB
C
642 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2016-2017 B.A.T.M.A.N. contributors:
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*
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* Matthias Schiffer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "netlink.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/byteorder/generic.h>
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#include <linux/cache.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/genetlink.h>
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#include <linux/gfp.h>
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#include <linux/if_ether.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/netlink.h>
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#include <linux/printk.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/skbuff.h>
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#include <linux/stddef.h>
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#include <linux/types.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/batadv_packet.h>
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#include <uapi/linux/batman_adv.h>
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#include "bat_algo.h"
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#include "bridge_loop_avoidance.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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#include "soft-interface.h"
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#include "tp_meter.h"
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#include "translation-table.h"
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struct genl_family batadv_netlink_family;
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/* multicast groups */
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enum batadv_netlink_multicast_groups {
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BATADV_NL_MCGRP_TPMETER,
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};
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static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
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[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
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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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};
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/**
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* batadv_netlink_get_ifindex() - Extract an interface index from a message
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* @nlh: Message header
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* @attrtype: Attribute which holds an interface index
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*
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* Return: interface index, or 0.
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*/
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int
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batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
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{
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struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
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return attr ? nla_get_u32(attr) : 0;
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}
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/**
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* batadv_netlink_mesh_info_put() - fill in generic information about mesh
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* interface
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* @msg: netlink message to be sent back
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* @soft_iface: interface for which the data should be taken
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*
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* Return: 0 on success, < 0 on error
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*/
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static int
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batadv_netlink_mesh_info_put(struct sk_buff *msg, struct net_device *soft_iface)
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{
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struct batadv_priv *bat_priv = netdev_priv(soft_iface);
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struct batadv_hard_iface *primary_if = NULL;
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struct net_device *hard_iface;
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int ret = -ENOBUFS;
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if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
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nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
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bat_priv->algo_ops->name) ||
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nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
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nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
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nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
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soft_iface->dev_addr) ||
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nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
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(u8)atomic_read(&bat_priv->tt.vn)))
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goto out;
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#ifdef CONFIG_BATMAN_ADV_BLA
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if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
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ntohs(bat_priv->bla.claim_dest.group)))
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goto out;
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#endif
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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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hard_iface = primary_if->net_dev;
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if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
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hard_iface->ifindex) ||
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nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
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hard_iface->name) ||
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nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
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hard_iface->dev_addr))
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goto out;
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}
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ret = 0;
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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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return ret;
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}
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/**
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* batadv_netlink_get_mesh_info() - handle incoming BATADV_CMD_GET_MESH_INFO
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* netlink request
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* @skb: received netlink message
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* @info: receiver information
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*
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* Return: 0 on success, < 0 on error
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*/
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static int
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batadv_netlink_get_mesh_info(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct net_device *soft_iface;
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struct sk_buff *msg = NULL;
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void *msg_head;
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int ifindex;
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int ret;
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if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
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return -EINVAL;
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ifindex = nla_get_u32(info->attrs[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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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg) {
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ret = -ENOMEM;
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goto out;
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}
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msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
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&batadv_netlink_family, 0,
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BATADV_CMD_GET_MESH_INFO);
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if (!msg_head) {
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ret = -ENOBUFS;
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goto out;
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}
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ret = batadv_netlink_mesh_info_put(msg, soft_iface);
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out:
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if (soft_iface)
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dev_put(soft_iface);
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if (ret) {
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if (msg)
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nlmsg_free(msg);
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return ret;
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}
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genlmsg_end(msg, msg_head);
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return genlmsg_reply(msg, info);
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}
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/**
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* batadv_netlink_tp_meter_put() - Fill information of started tp_meter session
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* @msg: netlink message to be sent back
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* @cookie: tp meter session cookie
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*
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* Return: 0 on success, < 0 on error
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*/
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static int
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batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
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{
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if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
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return -ENOBUFS;
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return 0;
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}
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/**
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* batadv_netlink_tpmeter_notify() - send tp_meter result via netlink to client
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* @bat_priv: the bat priv with all the soft interface information
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* @dst: destination of tp_meter session
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* @result: reason for tp meter session stop
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* @test_time: total time ot the tp_meter session
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* @total_bytes: bytes acked to the receiver
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* @cookie: cookie of tp_meter session
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*
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* Return: 0 on success, < 0 on error
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*/
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int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
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u8 result, u32 test_time, u64 total_bytes,
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u32 cookie)
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{
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struct sk_buff *msg;
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void *hdr;
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int ret;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
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BATADV_CMD_TP_METER);
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if (!hdr) {
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ret = -ENOBUFS;
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goto err_genlmsg;
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}
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if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
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goto nla_put_failure;
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if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
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goto nla_put_failure;
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if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
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BATADV_ATTR_PAD))
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goto nla_put_failure;
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if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
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goto nla_put_failure;
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if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
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goto nla_put_failure;
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genlmsg_end(msg, hdr);
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genlmsg_multicast_netns(&batadv_netlink_family,
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dev_net(bat_priv->soft_iface), msg, 0,
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BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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ret = -EMSGSIZE;
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err_genlmsg:
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nlmsg_free(msg);
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return ret;
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}
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/**
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* batadv_netlink_tp_meter_start() - Start a new tp_meter session
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* @skb: received netlink message
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* @info: receiver information
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*
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* Return: 0 on success, < 0 on error
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*/
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static int
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batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct net_device *soft_iface;
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struct batadv_priv *bat_priv;
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struct sk_buff *msg = NULL;
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u32 test_length;
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void *msg_head;
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int ifindex;
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u32 cookie;
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u8 *dst;
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int ret;
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if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
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return -EINVAL;
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if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
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return -EINVAL;
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if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
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return -EINVAL;
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ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
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if (!ifindex)
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return -EINVAL;
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dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
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test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
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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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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg) {
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ret = -ENOMEM;
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goto out;
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}
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msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
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&batadv_netlink_family, 0,
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BATADV_CMD_TP_METER);
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if (!msg_head) {
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ret = -ENOBUFS;
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goto out;
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}
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bat_priv = netdev_priv(soft_iface);
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batadv_tp_start(bat_priv, dst, test_length, &cookie);
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ret = batadv_netlink_tp_meter_put(msg, cookie);
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out:
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if (soft_iface)
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dev_put(soft_iface);
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if (ret) {
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if (msg)
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nlmsg_free(msg);
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return ret;
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}
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genlmsg_end(msg, msg_head);
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return genlmsg_reply(msg, info);
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}
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/**
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* batadv_netlink_tp_meter_start() - Cancel a running tp_meter session
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* @skb: received netlink message
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* @info: receiver information
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*
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* Return: 0 on success, < 0 on error
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*/
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static int
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batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
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{
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struct net *net = genl_info_net(info);
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struct net_device *soft_iface;
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struct batadv_priv *bat_priv;
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int ifindex;
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u8 *dst;
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int ret = 0;
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if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
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return -EINVAL;
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if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
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return -EINVAL;
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ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
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if (!ifindex)
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return -EINVAL;
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dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
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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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batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
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out:
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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_netlink_dump_hardif_entry() - Dump one hard interface into a message
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* @msg: Netlink message to dump into
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* @portid: Port making netlink request
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* @seq: Sequence number of netlink message
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* @hard_iface: Hard interface to dump
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*
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* Return: error code, or 0 on success
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*/
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static int
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batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
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struct batadv_hard_iface *hard_iface)
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{
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struct net_device *net_dev = hard_iface->net_dev;
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void *hdr;
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hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
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BATADV_CMD_GET_HARDIFS);
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if (!hdr)
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return -EMSGSIZE;
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if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
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net_dev->ifindex) ||
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nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
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net_dev->name) ||
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nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
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net_dev->dev_addr))
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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,
|
|
},
|
|
|
|
};
|
|
|
|
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);
|
|
}
|