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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/batman-adv/gateway_common.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/batman-adv/gateway_common.c')
-rw-r--r--net/batman-adv/gateway_common.c274
1 files changed, 274 insertions, 0 deletions
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 <linux/atomic.h>
+#include <linux/byteorder/generic.h>
+#include <linux/errno.h>
+#include <linux/kstrtox.h>
+#include <linux/limits.h>
+#include <linux/math64.h>
+#include <linux/netdevice.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <uapi/linux/batadv_packet.h>
+#include <uapi/linux/batman_adv.h>
+
+#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, &lthroughput);
+ 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);
+}