425 lines
10 KiB
C
425 lines
10 KiB
C
/* Copyright (C) 2016 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/errno.h>
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#include <linux/fs.h>
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#include <linux/genetlink.h>
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#include <linux/if_ether.h>
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#include <linux/init.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/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 <uapi/linux/batman_adv.h>
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#include "hard-interface.h"
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#include "soft-interface.h"
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#include "tp_meter.h"
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struct sk_buff;
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static struct genl_family batadv_netlink_family = {
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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = BATADV_NL_NAME,
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.version = 1,
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.maxattr = BATADV_ATTR_MAX,
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};
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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 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 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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};
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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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goto out;
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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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static struct genl_ops batadv_netlink_ops[] = {
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{
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.cmd = BATADV_CMD_GET_MESH_INFO,
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.flags = GENL_ADMIN_PERM,
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.policy = batadv_netlink_policy,
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.doit = batadv_netlink_get_mesh_info,
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},
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{
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.cmd = BATADV_CMD_TP_METER,
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.flags = GENL_ADMIN_PERM,
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.policy = batadv_netlink_policy,
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.doit = batadv_netlink_tp_meter_start,
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},
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{
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.cmd = BATADV_CMD_TP_METER_CANCEL,
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.flags = GENL_ADMIN_PERM,
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.policy = batadv_netlink_policy,
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.doit = batadv_netlink_tp_meter_cancel,
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},
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};
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/**
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* batadv_netlink_register - register batadv genl netlink family
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*/
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void __init batadv_netlink_register(void)
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{
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int ret;
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ret = genl_register_family_with_ops_groups(&batadv_netlink_family,
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batadv_netlink_ops,
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batadv_netlink_mcgrps);
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if (ret)
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pr_warn("unable to register netlink family");
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}
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/**
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* batadv_netlink_unregister - unregister batadv genl netlink family
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*/
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void batadv_netlink_unregister(void)
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{
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genl_unregister_family(&batadv_netlink_family);
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}
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