From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/batman-adv/gateway_common.c | 274 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 274 insertions(+) create mode 100644 net/batman-adv/gateway_common.c (limited to 'net/batman-adv/gateway_common.c') diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c new file mode 100644 index 000000000..9349c76f3 --- /dev/null +++ b/net/batman-adv/gateway_common.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) B.A.T.M.A.N. contributors: + * + * Marek Lindner + */ + +#include "gateway_common.h" +#include "main.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gateway_client.h" +#include "log.h" +#include "tvlv.h" + +/** + * batadv_parse_throughput() - parse supplied string buffer to extract + * throughput information + * @net_dev: the soft interface net device + * @buff: string buffer to parse + * @description: text shown when throughput string cannot be parsed + * @throughput: pointer holding the returned throughput information + * + * Return: false on parse error and true otherwise. + */ +bool batadv_parse_throughput(struct net_device *net_dev, char *buff, + const char *description, u32 *throughput) +{ + enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT; + u64 lthroughput; + char *tmp_ptr; + int ret; + + if (strlen(buff) > 4) { + tmp_ptr = buff + strlen(buff) - 4; + + if (strncasecmp(tmp_ptr, "mbit", 4) == 0) + bw_unit_type = BATADV_BW_UNIT_MBIT; + + if (strncasecmp(tmp_ptr, "kbit", 4) == 0 || + bw_unit_type == BATADV_BW_UNIT_MBIT) + *tmp_ptr = '\0'; + } + + ret = kstrtou64(buff, 10, <hroughput); + if (ret) { + batadv_err(net_dev, + "Invalid throughput speed for %s: %s\n", + description, buff); + return false; + } + + switch (bw_unit_type) { + case BATADV_BW_UNIT_MBIT: + /* prevent overflow */ + if (U64_MAX / 10 < lthroughput) { + batadv_err(net_dev, + "Throughput speed for %s too large: %s\n", + description, buff); + return false; + } + + lthroughput *= 10; + break; + case BATADV_BW_UNIT_KBIT: + default: + lthroughput = div_u64(lthroughput, 100); + break; + } + + if (lthroughput > U32_MAX) { + batadv_err(net_dev, + "Throughput speed for %s too large: %s\n", + description, buff); + return false; + } + + *throughput = lthroughput; + + return true; +} + +/** + * batadv_parse_gw_bandwidth() - parse supplied string buffer to extract + * download and upload bandwidth information + * @net_dev: the soft interface net device + * @buff: string buffer to parse + * @down: pointer holding the returned download bandwidth information + * @up: pointer holding the returned upload bandwidth information + * + * Return: false on parse error and true otherwise. + */ +static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, + u32 *down, u32 *up) +{ + char *slash_ptr; + bool ret; + + slash_ptr = strchr(buff, '/'); + if (slash_ptr) + *slash_ptr = 0; + + ret = batadv_parse_throughput(net_dev, buff, "download gateway speed", + down); + if (!ret) + return false; + + /* we also got some upload info */ + if (slash_ptr) { + ret = batadv_parse_throughput(net_dev, slash_ptr + 1, + "upload gateway speed", up); + if (!ret) + return false; + } + + return true; +} + +/** + * batadv_gw_tvlv_container_update() - update the gw tvlv container after + * gateway setting change + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv) +{ + struct batadv_tvlv_gateway_data gw; + u32 down, up; + char gw_mode; + + gw_mode = atomic_read(&bat_priv->gw.mode); + + switch (gw_mode) { + case BATADV_GW_MODE_OFF: + case BATADV_GW_MODE_CLIENT: + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1); + break; + case BATADV_GW_MODE_SERVER: + down = atomic_read(&bat_priv->gw.bandwidth_down); + up = atomic_read(&bat_priv->gw.bandwidth_up); + gw.bandwidth_down = htonl(down); + gw.bandwidth_up = htonl(up); + batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1, + &gw, sizeof(gw)); + break; + } +} + +/** + * batadv_gw_bandwidth_set() - Parse and set download/upload gateway bandwidth + * from supplied string buffer + * @net_dev: netdev struct of the soft interface + * @buff: the buffer containing the user data + * @count: number of bytes in the buffer + * + * Return: 'count' on success or a negative error code in case of failure + */ +ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff, + size_t count) +{ + struct batadv_priv *bat_priv = netdev_priv(net_dev); + u32 down_curr; + u32 up_curr; + u32 down_new = 0; + u32 up_new = 0; + bool ret; + + down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down); + up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up); + + ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new); + if (!ret) + return -EINVAL; + + if (!down_new) + down_new = 1; + + if (!up_new) + up_new = down_new / 5; + + if (!up_new) + up_new = 1; + + if (down_curr == down_new && up_curr == up_new) + return count; + + batadv_gw_reselect(bat_priv); + batadv_info(net_dev, + "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n", + down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10, + down_new / 10, down_new % 10, up_new / 10, up_new % 10); + + atomic_set(&bat_priv->gw.bandwidth_down, down_new); + atomic_set(&bat_priv->gw.bandwidth_up, up_new); + batadv_gw_tvlv_container_update(bat_priv); + + return count; +} + +/** + * batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container + * @bat_priv: the bat priv with all the soft interface information + * @orig: the orig_node of the ogm + * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) + * @tvlv_value: tvlv buffer containing the gateway data + * @tvlv_value_len: tvlv buffer length + */ +static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig, + u8 flags, + void *tvlv_value, u16 tvlv_value_len) +{ + struct batadv_tvlv_gateway_data gateway, *gateway_ptr; + + /* only fetch the tvlv value if the handler wasn't called via the + * CIFNOTFND flag and if there is data to fetch + */ + if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND || + tvlv_value_len < sizeof(gateway)) { + gateway.bandwidth_down = 0; + gateway.bandwidth_up = 0; + } else { + gateway_ptr = tvlv_value; + gateway.bandwidth_down = gateway_ptr->bandwidth_down; + gateway.bandwidth_up = gateway_ptr->bandwidth_up; + if (gateway.bandwidth_down == 0 || + gateway.bandwidth_up == 0) { + gateway.bandwidth_down = 0; + gateway.bandwidth_up = 0; + } + } + + batadv_gw_node_update(bat_priv, orig, &gateway); + + /* restart gateway selection */ + if (gateway.bandwidth_down != 0 && + atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT) + batadv_gw_check_election(bat_priv, orig); +} + +/** + * batadv_gw_init() - initialise the gateway handling internals + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_init(struct batadv_priv *bat_priv) +{ + if (bat_priv->algo_ops->gw.init_sel_class) + bat_priv->algo_ops->gw.init_sel_class(bat_priv); + else + atomic_set(&bat_priv->gw.sel_class, 1); + + batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1, + NULL, BATADV_TVLV_GW, 1, + BATADV_TVLV_HANDLER_OGM_CIFNOTFND); +} + +/** + * batadv_gw_free() - free the gateway handling internals + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_gw_free(struct batadv_priv *bat_priv) +{ + batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1); +} -- cgit v1.2.3