diff options
Diffstat (limited to 'net/batman-adv/gateway_common.c')
| -rw-r--r-- | net/batman-adv/gateway_common.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c new file mode 100644 index 000000000000..0cb5e6b6f6d4 --- /dev/null +++ b/net/batman-adv/gateway_common.c @@ -0,0 +1,287 @@ +/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "gateway_common.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/errno.h> +#include <linux/byteorder/generic.h> +#include <linux/kernel.h> +#include <linux/math64.h> +#include <linux/netdevice.h> +#include <linux/stddef.h> +#include <linux/string.h> + +#include "gateway_client.h" +#include "packet.h" + +/** + * 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 + * + * Returns false on parse error and true otherwise. + */ +static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, + u32 *down, u32 *up) +{ + enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT; + char *slash_ptr, *tmp_ptr; + u64 ldown, lup; + int ret; + + slash_ptr = strchr(buff, '/'); + if (slash_ptr) + *slash_ptr = 0; + + 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, &ldown); + if (ret) { + batadv_err(net_dev, + "Download speed of gateway mode invalid: %s\n", + buff); + return false; + } + + switch (bw_unit_type) { + case BATADV_BW_UNIT_MBIT: + /* prevent overflow */ + if (U64_MAX / 10 < ldown) { + batadv_err(net_dev, + "Download speed of gateway mode too large: %s\n", + buff); + return false; + } + + ldown *= 10; + break; + case BATADV_BW_UNIT_KBIT: + default: + ldown = div_u64(ldown, 100); + break; + } + + if (U32_MAX < ldown) { + batadv_err(net_dev, + "Download speed of gateway mode too large: %s\n", + buff); + return false; + } + + *down = ldown; + + /* we also got some upload info */ + if (slash_ptr) { + bw_unit_type = BATADV_BW_UNIT_KBIT; + + if (strlen(slash_ptr + 1) > 4) { + tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1); + + 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(slash_ptr + 1, 10, &lup); + if (ret) { + batadv_err(net_dev, + "Upload speed of gateway mode invalid: %s\n", + slash_ptr + 1); + return false; + } + + switch (bw_unit_type) { + case BATADV_BW_UNIT_MBIT: + /* prevent overflow */ + if (U64_MAX / 10 < lup) { + batadv_err(net_dev, + "Upload speed of gateway mode too large: %s\n", + slash_ptr + 1); + return false; + } + + lup *= 10; + break; + case BATADV_BW_UNIT_KBIT: + default: + lup = div_u64(lup, 100); + break; + } + + if (U32_MAX < lup) { + batadv_err(net_dev, + "Upload speed of gateway mode too large: %s\n", + slash_ptr + 1); + return false; + } + + *up = lup; + } + + 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; + } +} + +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 fast or late switching was enabled */ + if ((gateway.bandwidth_down != 0) && + (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && + (atomic_read(&bat_priv->gw_sel_class) > 2)) + 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) +{ + 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); +} |