mirror of https://gitee.com/openkylin/linux.git
286 lines
7.8 KiB
C
286 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2009-2019 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner
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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 "gateway_common.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/errno.h>
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#include <linux/kernel.h>
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#include <linux/math64.h>
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#include <linux/netdevice.h>
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#include <linux/stddef.h>
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#include <linux/string.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 "gateway_client.h"
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#include "log.h"
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#include "tvlv.h"
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/**
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* batadv_parse_throughput() - parse supplied string buffer to extract
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* throughput information
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* @net_dev: the soft interface net device
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* @buff: string buffer to parse
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* @description: text shown when throughput string cannot be parsed
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* @throughput: pointer holding the returned throughput information
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*
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* Return: false on parse error and true otherwise.
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*/
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bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
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const char *description, u32 *throughput)
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{
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enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
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u64 lthroughput;
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char *tmp_ptr;
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int ret;
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if (strlen(buff) > 4) {
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tmp_ptr = buff + strlen(buff) - 4;
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if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
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bw_unit_type = BATADV_BW_UNIT_MBIT;
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if (strncasecmp(tmp_ptr, "kbit", 4) == 0 ||
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bw_unit_type == BATADV_BW_UNIT_MBIT)
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*tmp_ptr = '\0';
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}
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ret = kstrtou64(buff, 10, <hroughput);
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if (ret) {
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batadv_err(net_dev,
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"Invalid throughput speed for %s: %s\n",
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description, buff);
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return false;
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}
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switch (bw_unit_type) {
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case BATADV_BW_UNIT_MBIT:
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/* prevent overflow */
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if (U64_MAX / 10 < lthroughput) {
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batadv_err(net_dev,
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"Throughput speed for %s too large: %s\n",
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description, buff);
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return false;
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}
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lthroughput *= 10;
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break;
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case BATADV_BW_UNIT_KBIT:
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default:
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lthroughput = div_u64(lthroughput, 100);
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break;
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}
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if (lthroughput > U32_MAX) {
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batadv_err(net_dev,
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"Throughput speed for %s too large: %s\n",
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description, buff);
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return false;
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}
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*throughput = lthroughput;
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return true;
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}
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/**
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* batadv_parse_gw_bandwidth() - parse supplied string buffer to extract
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* download and upload bandwidth information
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* @net_dev: the soft interface net device
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* @buff: string buffer to parse
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* @down: pointer holding the returned download bandwidth information
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* @up: pointer holding the returned upload bandwidth information
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*
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* Return: false on parse error and true otherwise.
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*/
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static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
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u32 *down, u32 *up)
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{
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char *slash_ptr;
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bool ret;
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slash_ptr = strchr(buff, '/');
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if (slash_ptr)
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*slash_ptr = 0;
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ret = batadv_parse_throughput(net_dev, buff, "download gateway speed",
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down);
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if (!ret)
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return false;
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/* we also got some upload info */
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if (slash_ptr) {
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ret = batadv_parse_throughput(net_dev, slash_ptr + 1,
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"upload gateway speed", up);
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if (!ret)
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return false;
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}
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return true;
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}
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/**
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* batadv_gw_tvlv_container_update() - update the gw tvlv container after
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* gateway setting change
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* @bat_priv: the bat priv with all the soft interface information
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*/
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void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
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{
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struct batadv_tvlv_gateway_data gw;
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u32 down, up;
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char gw_mode;
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gw_mode = atomic_read(&bat_priv->gw.mode);
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switch (gw_mode) {
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case BATADV_GW_MODE_OFF:
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case BATADV_GW_MODE_CLIENT:
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batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
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break;
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case BATADV_GW_MODE_SERVER:
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down = atomic_read(&bat_priv->gw.bandwidth_down);
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up = atomic_read(&bat_priv->gw.bandwidth_up);
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gw.bandwidth_down = htonl(down);
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gw.bandwidth_up = htonl(up);
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batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
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&gw, sizeof(gw));
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break;
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}
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}
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/**
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* batadv_gw_bandwidth_set() - Parse and set download/upload gateway bandwidth
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* from supplied string buffer
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* @net_dev: netdev struct of the soft interface
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* @buff: the buffer containing the user data
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* @count: number of bytes in the buffer
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*
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* Return: 'count' on success or a negative error code in case of failure
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*/
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ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
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size_t count)
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{
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struct batadv_priv *bat_priv = netdev_priv(net_dev);
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u32 down_curr;
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u32 up_curr;
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u32 down_new = 0;
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u32 up_new = 0;
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bool ret;
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down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
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up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);
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ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
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if (!ret)
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return -EINVAL;
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if (!down_new)
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down_new = 1;
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if (!up_new)
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up_new = down_new / 5;
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if (!up_new)
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up_new = 1;
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if (down_curr == down_new && up_curr == up_new)
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return count;
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batadv_gw_reselect(bat_priv);
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batadv_info(net_dev,
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"Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
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down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
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down_new / 10, down_new % 10, up_new / 10, up_new % 10);
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atomic_set(&bat_priv->gw.bandwidth_down, down_new);
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atomic_set(&bat_priv->gw.bandwidth_up, up_new);
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batadv_gw_tvlv_container_update(bat_priv);
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return count;
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}
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/**
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* batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container
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* @bat_priv: the bat priv with all the soft interface information
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* @orig: the orig_node of the ogm
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* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
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* @tvlv_value: tvlv buffer containing the gateway data
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* @tvlv_value_len: tvlv buffer length
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*/
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static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig,
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u8 flags,
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void *tvlv_value, u16 tvlv_value_len)
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{
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struct batadv_tvlv_gateway_data gateway, *gateway_ptr;
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/* only fetch the tvlv value if the handler wasn't called via the
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* CIFNOTFND flag and if there is data to fetch
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*/
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if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND ||
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tvlv_value_len < sizeof(gateway)) {
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gateway.bandwidth_down = 0;
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gateway.bandwidth_up = 0;
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} else {
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gateway_ptr = tvlv_value;
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gateway.bandwidth_down = gateway_ptr->bandwidth_down;
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gateway.bandwidth_up = gateway_ptr->bandwidth_up;
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if (gateway.bandwidth_down == 0 ||
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gateway.bandwidth_up == 0) {
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gateway.bandwidth_down = 0;
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gateway.bandwidth_up = 0;
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}
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}
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batadv_gw_node_update(bat_priv, orig, &gateway);
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/* restart gateway selection */
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if (gateway.bandwidth_down != 0 &&
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atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT)
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batadv_gw_check_election(bat_priv, orig);
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}
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/**
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* batadv_gw_init() - initialise the gateway handling internals
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* @bat_priv: the bat priv with all the soft interface information
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*/
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void batadv_gw_init(struct batadv_priv *bat_priv)
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{
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if (bat_priv->algo_ops->gw.init_sel_class)
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bat_priv->algo_ops->gw.init_sel_class(bat_priv);
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else
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atomic_set(&bat_priv->gw.sel_class, 1);
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batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
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NULL, BATADV_TVLV_GW, 1,
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BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
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}
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/**
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* batadv_gw_free() - free the gateway handling internals
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* @bat_priv: the bat priv with all the soft interface information
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*/
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void batadv_gw_free(struct batadv_priv *bat_priv)
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{
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batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
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batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
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}
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