^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Copyright (C) 2012-2020 B.A.T.M.A.N. contributors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Martin Hundebøll, Jeppe Ledet-Pedersen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include "network-coding.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "main.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/byteorder/generic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/etherdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/if_ether.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/if_packet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/jhash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/kref.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/lockdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/prandom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <uapi/linux/batadv_packet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include "hard-interface.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include "hash.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include "log.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include "originator.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include "routing.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include "send.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include "tvlv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static struct lock_class_key batadv_nc_coding_hash_lock_class_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static struct lock_class_key batadv_nc_decoding_hash_lock_class_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static void batadv_nc_worker(struct work_struct *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct batadv_hard_iface *recv_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * batadv_nc_init() - one-time initialization for network coding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * Return: 0 on success or negative error number in case of failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int __init batadv_nc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* Register our packet type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) ret = batadv_recv_handler_register(BATADV_CODED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) batadv_nc_recv_coded_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * batadv_nc_start_timer() - initialise the nc periodic worker
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static void batadv_nc_start_timer(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) msecs_to_jiffies(10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * batadv_nc_tvlv_container_update() - update the network coding tvlv container
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * after network coding setting change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static void batadv_nc_tvlv_container_update(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) char nc_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) nc_mode = atomic_read(&bat_priv->network_coding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) switch (nc_mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) batadv_tvlv_container_register(bat_priv, BATADV_TVLV_NC, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * batadv_nc_status_update() - update the network coding tvlv container after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * network coding setting change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * @net_dev: the soft interface net device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) void batadv_nc_status_update(struct net_device *net_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct batadv_priv *bat_priv = netdev_priv(net_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) batadv_nc_tvlv_container_update(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * batadv_nc_tvlv_ogm_handler_v1() - process incoming nc tvlv container
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * @orig: the orig_node of the ogm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * @tvlv_value: tvlv buffer containing the gateway data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * @tvlv_value_len: tvlv buffer length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct batadv_orig_node *orig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) u8 flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) void *tvlv_value, u16 tvlv_value_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * batadv_nc_mesh_init() - initialise coding hash table and start housekeeping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * Return: 0 on success or negative error number in case of failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int batadv_nc_mesh_init(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) bat_priv->nc.timestamp_fwd_flush = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) bat_priv->nc.timestamp_sniffed_purge = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) bat_priv->nc.coding_hash = batadv_hash_new(128);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!bat_priv->nc.coding_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) batadv_hash_set_lock_class(bat_priv->nc.coding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) &batadv_nc_coding_hash_lock_class_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) bat_priv->nc.decoding_hash = batadv_hash_new(128);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (!bat_priv->nc.decoding_hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) batadv_hash_destroy(bat_priv->nc.coding_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) batadv_hash_set_lock_class(bat_priv->nc.decoding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) &batadv_nc_decoding_hash_lock_class_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) batadv_nc_start_timer(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) batadv_tvlv_handler_register(bat_priv, batadv_nc_tvlv_ogm_handler_v1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) NULL, BATADV_TVLV_NC, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) batadv_nc_tvlv_container_update(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * batadv_nc_init_bat_priv() - initialise the nc specific bat_priv variables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) atomic_set(&bat_priv->network_coding, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) bat_priv->nc.min_tq = 200;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) bat_priv->nc.max_fwd_delay = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) bat_priv->nc.max_buffer_time = 200;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * batadv_nc_init_orig() - initialise the nc fields of an orig_node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * @orig_node: the orig_node which is going to be initialised
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) void batadv_nc_init_orig(struct batadv_orig_node *orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) INIT_LIST_HEAD(&orig_node->in_coding_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) INIT_LIST_HEAD(&orig_node->out_coding_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) spin_lock_init(&orig_node->in_coding_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) spin_lock_init(&orig_node->out_coding_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * batadv_nc_node_release() - release nc_node from lists and queue for free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * after rcu grace period
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * @ref: kref pointer of the nc_node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static void batadv_nc_node_release(struct kref *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) struct batadv_nc_node *nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) nc_node = container_of(ref, struct batadv_nc_node, refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) batadv_orig_node_put(nc_node->orig_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) kfree_rcu(nc_node, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * batadv_nc_node_put() - decrement the nc_node refcounter and possibly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * release it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * @nc_node: nc_node to be free'd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) static void batadv_nc_node_put(struct batadv_nc_node *nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (!nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) kref_put(&nc_node->refcount, batadv_nc_node_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * batadv_nc_path_release() - release nc_path from lists and queue for free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * after rcu grace period
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * @ref: kref pointer of the nc_path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static void batadv_nc_path_release(struct kref *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) struct batadv_nc_path *nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) nc_path = container_of(ref, struct batadv_nc_path, refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) kfree_rcu(nc_path, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * batadv_nc_path_put() - decrement the nc_path refcounter and possibly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * release it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * @nc_path: nc_path to be free'd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static void batadv_nc_path_put(struct batadv_nc_path *nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (!nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) kref_put(&nc_path->refcount, batadv_nc_path_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * batadv_nc_packet_free() - frees nc packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * @nc_packet: the nc packet to free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * @dropped: whether the packet is freed because is dropped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) bool dropped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (dropped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) kfree_skb(nc_packet->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) consume_skb(nc_packet->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) batadv_nc_path_put(nc_packet->nc_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) kfree(nc_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * batadv_nc_to_purge_nc_node() - checks whether an nc node has to be purged
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * @nc_node: the nc node to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * Return: true if the entry has to be purged now, false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct batadv_nc_node *nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * batadv_nc_to_purge_nc_path_coding() - checks whether an nc path has timed out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * @nc_path: the nc path to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * Return: true if the entry has to be purged now, false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) struct batadv_nc_path *nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* purge the path when no packets has been added for 10 times the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * max_fwd_delay time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return batadv_has_timed_out(nc_path->last_valid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) bat_priv->nc.max_fwd_delay * 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * batadv_nc_to_purge_nc_path_decoding() - checks whether an nc path has timed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * @nc_path: the nc path to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * Return: true if the entry has to be purged now, false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct batadv_nc_path *nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* purge the path when no packets has been added for 10 times the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * max_buffer time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return batadv_has_timed_out(nc_path->last_valid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) bat_priv->nc.max_buffer_time * 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * batadv_nc_purge_orig_nc_nodes() - go through list of nc nodes and purge stale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * @list: list of nc nodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * @lock: nc node list lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * @to_purge: function in charge to decide whether an entry has to be purged or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * not. This function takes the nc node as argument and has to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * a boolean value: true if the entry has to be deleted, false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) struct list_head *list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) spinlock_t *lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) bool (*to_purge)(struct batadv_priv *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct batadv_nc_node *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) struct batadv_nc_node *nc_node, *nc_node_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* For each nc_node in list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) spin_lock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /* if an helper function has been passed as parameter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * ask it if the entry has to be purged or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (to_purge && !to_purge(bat_priv, nc_node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) batadv_dbg(BATADV_DBG_NC, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) "Removing nc_node %pM -> %pM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) nc_node->addr, nc_node->orig_node->orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) list_del_rcu(&nc_node->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) batadv_nc_node_put(nc_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) spin_unlock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * batadv_nc_purge_orig() - purges all nc node data attached of the given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * originator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * @orig_node: orig_node with the nc node entries to be purged
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * @to_purge: function in charge to decide whether an entry has to be purged or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * not. This function takes the nc node as argument and has to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * a boolean value: true is the entry has to be deleted, false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) void batadv_nc_purge_orig(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct batadv_orig_node *orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) bool (*to_purge)(struct batadv_priv *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) struct batadv_nc_node *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* Check ingoing nc_node's of this orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) &orig_node->in_coding_list_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) to_purge);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) /* Check outgoing nc_node's of this orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) &orig_node->out_coding_list_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) to_purge);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) * batadv_nc_purge_orig_hash() - traverse entire originator hash to check if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) * they have timed out nc nodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct batadv_hashtable *hash = bat_priv->orig_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct batadv_orig_node *orig_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) u32 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (!hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /* For each orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) for (i = 0; i < hash->size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) head = &hash->table[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) hlist_for_each_entry_rcu(orig_node, head, hash_entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) batadv_nc_purge_orig(bat_priv, orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) batadv_nc_to_purge_nc_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * batadv_nc_purge_paths() - traverse all nc paths part of the hash and remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * unused ones
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * @hash: hash table containing the nc paths to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * @to_purge: function in charge to decide whether an entry has to be purged or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * not. This function takes the nc node as argument and has to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * a boolean value: true is the entry has to be deleted, false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) static void batadv_nc_purge_paths(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) struct batadv_hashtable *hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) bool (*to_purge)(struct batadv_priv *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) struct batadv_nc_path *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) struct hlist_node *node_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) struct batadv_nc_path *nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) spinlock_t *lock; /* Protects lists in hash */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) u32 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) for (i = 0; i < hash->size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) head = &hash->table[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) lock = &hash->list_locks[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* For each nc_path in this bin */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) spin_lock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) /* if an helper function has been passed as parameter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * ask it if the entry has to be purged or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (to_purge && !to_purge(bat_priv, nc_path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) /* purging an non-empty nc_path should never happen, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) * is observed under high CPU load. Delay the purging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) * until next iteration to allow the packet_list to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) * emptied first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (!unlikely(list_empty(&nc_path->packet_list))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) net_ratelimited_function(printk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) KERN_WARNING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) "Skipping free of non-empty nc_path (%pM -> %pM)!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) nc_path->prev_hop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) nc_path->next_hop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) /* nc_path is unused, so remove it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) batadv_dbg(BATADV_DBG_NC, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) "Remove nc_path %pM -> %pM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) nc_path->prev_hop, nc_path->next_hop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) hlist_del_rcu(&nc_path->hash_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) batadv_nc_path_put(nc_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) spin_unlock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * batadv_nc_hash_key_gen() - computes the nc_path hash key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * @key: buffer to hold the final hash key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * @src: source ethernet mac address going into the hash key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * @dst: destination ethernet mac address going into the hash key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) const char *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) memcpy(key->prev_hop, src, sizeof(key->prev_hop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) memcpy(key->next_hop, dst, sizeof(key->next_hop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * batadv_nc_hash_choose() - compute the hash value for an nc path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * @data: data to hash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * @size: size of the hash table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * Return: the selected index in the hash table for the given data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) static u32 batadv_nc_hash_choose(const void *data, u32 size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) const struct batadv_nc_path *nc_path = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) u32 hash = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) hash = jhash(&nc_path->prev_hop, sizeof(nc_path->prev_hop), hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) hash = jhash(&nc_path->next_hop, sizeof(nc_path->next_hop), hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) return hash % size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * batadv_nc_hash_compare() - comparing function used in the network coding hash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * tables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * @node: node in the local table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * @data2: second object to compare the node to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) * Return: true if the two entry are the same, false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) static bool batadv_nc_hash_compare(const struct hlist_node *node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) const void *data2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) const struct batadv_nc_path *nc_path1, *nc_path2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) nc_path1 = container_of(node, struct batadv_nc_path, hash_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) nc_path2 = data2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) /* Return 1 if the two keys are identical */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * batadv_nc_hash_find() - search for an existing nc path and return it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) * @hash: hash table containing the nc path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) * @data: search key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * Return: the nc_path if found, NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) static struct batadv_nc_path *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) batadv_nc_hash_find(struct batadv_hashtable *hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) struct batadv_nc_path *nc_path, *nc_path_tmp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (!hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) index = batadv_nc_hash_choose(data, hash->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) head = &hash->table[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) hlist_for_each_entry_rcu(nc_path, head, hash_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) if (!batadv_nc_hash_compare(&nc_path->hash_entry, data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (!kref_get_unless_zero(&nc_path->refcount))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) nc_path_tmp = nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return nc_path_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * batadv_nc_send_packet() - send non-coded packet and free nc_packet struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * @nc_packet: the nc packet to send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) nc_packet->skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) batadv_nc_packet_free(nc_packet, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * batadv_nc_sniffed_purge() - Checks timestamp of given sniffed nc_packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) * @nc_path: the nc path the packet belongs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) * @nc_packet: the nc packet to be checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) * Checks whether the given sniffed (overheard) nc_packet has hit its buffering
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) * timeout. If so, the packet is no longer kept and the entry deleted from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) * queue. Has to be called with the appropriate locks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) * Return: false as soon as the entry in the fifo queue has not been timed out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) * yet and true otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) struct batadv_nc_path *nc_path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct batadv_nc_packet *nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) unsigned long timeout = bat_priv->nc.max_buffer_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) bool res = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) lockdep_assert_held(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) /* Packets are added to tail, so the remaining packets did not time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * out and we can stop processing the current queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) !batadv_has_timed_out(nc_packet->timestamp, timeout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) /* purge nc packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) list_del(&nc_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) batadv_nc_packet_free(nc_packet, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) res = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * batadv_nc_fwd_flush() - Checks the timestamp of the given nc packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) * @nc_path: the nc path the packet belongs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) * @nc_packet: the nc packet to be checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) * Checks whether the given nc packet has hit its forward timeout. If so, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) * packet is no longer delayed, immediately sent and the entry deleted from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * queue. Has to be called with the appropriate locks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * Return: false as soon as the entry in the fifo queue has not been timed out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) * yet and true otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) struct batadv_nc_path *nc_path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) struct batadv_nc_packet *nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) unsigned long timeout = bat_priv->nc.max_fwd_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) lockdep_assert_held(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /* Packets are added to tail, so the remaining packets did not time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) * out and we can stop processing the current queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) !batadv_has_timed_out(nc_packet->timestamp, timeout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) /* Send packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) nc_packet->skb->len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) list_del(&nc_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) batadv_nc_send_packet(nc_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * batadv_nc_process_nc_paths() - traverse given nc packet pool and free timed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) * out nc packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * @hash: to be processed hash table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) * @process_fn: Function called to process given nc packet. Should return true
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * to encourage this function to proceed with the next packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * Otherwise the rest of the current queue is skipped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) batadv_nc_process_nc_paths(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) struct batadv_hashtable *hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) bool (*process_fn)(struct batadv_priv *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) struct batadv_nc_path *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) struct batadv_nc_packet *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) struct batadv_nc_packet *nc_packet, *nc_packet_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) struct batadv_nc_path *nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) if (!hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) /* Loop hash table bins */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) for (i = 0; i < hash->size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) head = &hash->table[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) /* Loop coding paths */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) hlist_for_each_entry_rcu(nc_path, head, hash_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) /* Loop packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) spin_lock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) list_for_each_entry_safe(nc_packet, nc_packet_tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) &nc_path->packet_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) ret = process_fn(bat_priv, nc_path, nc_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) spin_unlock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * batadv_nc_worker() - periodic task for housekeeping related to network
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * coding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * @work: kernel work struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) static void batadv_nc_worker(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) struct delayed_work *delayed_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) struct batadv_priv_nc *priv_nc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) struct batadv_priv *bat_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) unsigned long timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) delayed_work = to_delayed_work(work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) priv_nc = container_of(delayed_work, struct batadv_priv_nc, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) bat_priv = container_of(priv_nc, struct batadv_priv, nc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) batadv_nc_purge_orig_hash(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) batadv_nc_to_purge_nc_path_coding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) batadv_nc_to_purge_nc_path_decoding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) timeout = bat_priv->nc.max_fwd_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) batadv_nc_fwd_flush);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) bat_priv->nc.timestamp_fwd_flush = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) bat_priv->nc.max_buffer_time)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) batadv_nc_sniffed_purge);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) bat_priv->nc.timestamp_sniffed_purge = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) /* Schedule a new check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) batadv_nc_start_timer(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) * batadv_can_nc_with_orig() - checks whether the given orig node is suitable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) * for coding or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) * @orig_node: neighboring orig node which may be used as nc candidate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) * @ogm_packet: incoming ogm packet also used for the checks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) * Return: true if:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) * 1) The OGM must have the most recent sequence number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) * 2) The TTL must be decremented by one and only one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) * 3) The OGM must be received from the first hop from orig_node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) struct batadv_orig_node *orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) struct batadv_ogm_packet *ogm_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) struct batadv_orig_ifinfo *orig_ifinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) u32 last_real_seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) u8 last_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) orig_ifinfo = batadv_orig_ifinfo_get(orig_node, BATADV_IF_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (!orig_ifinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) last_ttl = orig_ifinfo->last_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) last_real_seqno = orig_ifinfo->last_real_seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) batadv_orig_ifinfo_put(orig_ifinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) if (last_real_seqno != ntohl(ogm_packet->seqno))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) if (last_ttl != ogm_packet->ttl + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) if (ogm_packet->tq < bat_priv->nc.min_tq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) * batadv_nc_find_nc_node() - search for an existing nc node and return it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) * @orig_node: orig node originating the ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * @orig_neigh_node: neighboring orig node from which we received the ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) * (can be equal to orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) * @in_coding: traverse incoming or outgoing network coding list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) * Return: the nc_node if found, NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) static struct batadv_nc_node *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) batadv_nc_find_nc_node(struct batadv_orig_node *orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) struct batadv_orig_node *orig_neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) bool in_coding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) struct batadv_nc_node *nc_node, *nc_node_out = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) struct list_head *list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) if (in_coding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) list = &orig_neigh_node->in_coding_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) list = &orig_neigh_node->out_coding_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) /* Traverse list of nc_nodes to orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) list_for_each_entry_rcu(nc_node, list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) if (!batadv_compare_eth(nc_node->addr, orig_node->orig))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (!kref_get_unless_zero(&nc_node->refcount))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) /* Found a match */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) nc_node_out = nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) return nc_node_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * batadv_nc_get_nc_node() - retrieves an nc node or creates the entry if it was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * not found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) * @orig_node: orig node originating the ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) * @orig_neigh_node: neighboring orig node from which we received the ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) * (can be equal to orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) * @in_coding: traverse incoming or outgoing network coding list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) * Return: the nc_node if found or created, NULL in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) static struct batadv_nc_node *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) batadv_nc_get_nc_node(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) struct batadv_orig_node *orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) struct batadv_orig_node *orig_neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) bool in_coding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) struct batadv_nc_node *nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) spinlock_t *lock; /* Used to lock list selected by "int in_coding" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) struct list_head *list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) /* Select ingoing or outgoing coding node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) if (in_coding) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) lock = &orig_neigh_node->in_coding_list_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) list = &orig_neigh_node->in_coding_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) lock = &orig_neigh_node->out_coding_list_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) list = &orig_neigh_node->out_coding_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) spin_lock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) /* Check if nc_node is already added */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) /* Node found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) if (nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (!nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) /* Initialize nc_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) INIT_LIST_HEAD(&nc_node->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) kref_init(&nc_node->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) ether_addr_copy(nc_node->addr, orig_node->orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) kref_get(&orig_neigh_node->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) nc_node->orig_node = orig_neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) nc_node->addr, nc_node->orig_node->orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) /* Add nc_node to orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) kref_get(&nc_node->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) list_add_tail_rcu(&nc_node->list, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) spin_unlock_bh(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) return nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) * batadv_nc_update_nc_node() - updates stored incoming and outgoing nc node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * structs (best called on incoming OGMs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) * @orig_node: orig node originating the ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) * @orig_neigh_node: neighboring orig node from which we received the ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) * (can be equal to orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) * @ogm_packet: incoming ogm packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) * @is_single_hop_neigh: orig_node is a single hop neighbor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) void batadv_nc_update_nc_node(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) struct batadv_orig_node *orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) struct batadv_orig_node *orig_neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) struct batadv_ogm_packet *ogm_packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) int is_single_hop_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) struct batadv_nc_node *in_nc_node = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) struct batadv_nc_node *out_nc_node = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) /* Check if network coding is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) if (!atomic_read(&bat_priv->network_coding))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) /* check if orig node is network coding enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) /* accept ogms from 'good' neighbors and single hop neighbors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) !is_single_hop_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) /* Add orig_node as in_nc_node on hop */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) orig_neigh_node, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (!in_nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) in_nc_node->last_seen = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) /* Add hop as out_nc_node on orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) orig_node, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) if (!out_nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) out_nc_node->last_seen = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) if (in_nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) batadv_nc_node_put(in_nc_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) if (out_nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) batadv_nc_node_put(out_nc_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) * batadv_nc_get_path() - get existing nc_path or allocate a new one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) * @hash: hash table containing the nc path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) * @src: ethernet source address - first half of the nc path search key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) * @dst: ethernet destination address - second half of the nc path search key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) * Return: pointer to nc_path if the path was found or created, returns NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) * on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) struct batadv_hashtable *hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) u8 *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) int hash_added;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) struct batadv_nc_path *nc_path, nc_path_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) batadv_nc_hash_key_gen(&nc_path_key, src, dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) /* Search for existing nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) if (nc_path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) /* Set timestamp to delay removal of nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) nc_path->last_valid = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) return nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) /* No existing nc_path was found; create a new */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) if (!nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) /* Initialize nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) INIT_LIST_HEAD(&nc_path->packet_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) spin_lock_init(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) kref_init(&nc_path->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) nc_path->last_valid = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) ether_addr_copy(nc_path->next_hop, dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) ether_addr_copy(nc_path->prev_hop, src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) nc_path->prev_hop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) nc_path->next_hop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) /* Add nc_path to hash table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) kref_get(&nc_path->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) hash_added = batadv_hash_add(hash, batadv_nc_hash_compare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) batadv_nc_hash_choose, &nc_path_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) &nc_path->hash_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (hash_added < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) kfree(nc_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) return nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) * batadv_nc_random_weight_tq() - scale the receivers TQ-value to avoid unfair
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) * selection of a receiver with slightly lower TQ than the other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) * @tq: to be weighted tq value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) * Return: scaled tq value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) static u8 batadv_nc_random_weight_tq(u8 tq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) /* randomize the estimated packet loss (max TQ - estimated TQ) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) u8 rand_tq = prandom_u32_max(BATADV_TQ_MAX_VALUE + 1 - tq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) /* convert to (randomized) estimated tq again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) return BATADV_TQ_MAX_VALUE - rand_tq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) * batadv_nc_memxor() - XOR destination with source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) * @dst: byte array to XOR into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) * @src: byte array to XOR from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) * @len: length of destination array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) static void batadv_nc_memxor(char *dst, const char *src, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) for (i = 0; i < len; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) dst[i] ^= src[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) * batadv_nc_code_packets() - code a received unicast_packet with an nc packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) * into a coded_packet and send it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) * @skb: data skb to forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) * @ethhdr: pointer to the ethernet header inside the skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) * @nc_packet: structure containing the packet to the skb can be coded with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) * @neigh_node: next hop to forward packet to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) * Return: true if both packets are consumed, false otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) static bool batadv_nc_code_packets(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) struct ethhdr *ethhdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) struct batadv_nc_packet *nc_packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) struct batadv_neigh_node *neigh_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) u8 tq_weighted_neigh, tq_weighted_coding, tq_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) struct sk_buff *skb_dest, *skb_src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) struct batadv_unicast_packet *packet1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) struct batadv_unicast_packet *packet2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) struct batadv_coded_packet *coded_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) struct batadv_neigh_node *router_coding = NULL, *second_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) u8 *first_source, *second_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) __be32 packet_id1, packet_id2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) size_t count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) bool res = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) int coding_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) int unicast_size = sizeof(*packet1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) int coded_size = sizeof(*coded_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) int header_add = coded_size - unicast_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) /* TODO: do we need to consider the outgoing interface for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) * coded packets?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) router_neigh = batadv_orig_router_get(neigh_node->orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) BATADV_IF_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) if (!router_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) router_neigh_ifinfo = batadv_neigh_ifinfo_get(router_neigh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) BATADV_IF_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) if (!router_neigh_ifinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) neigh_tmp = nc_packet->neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) router_coding = batadv_orig_router_get(neigh_tmp->orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) BATADV_IF_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) if (!router_coding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) router_coding_ifinfo = batadv_neigh_ifinfo_get(router_coding,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) BATADV_IF_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) if (!router_coding_ifinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) tq_tmp = router_neigh_ifinfo->bat_iv.tq_avg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) tq_weighted_neigh = batadv_nc_random_weight_tq(tq_tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) tq_tmp = router_coding_ifinfo->bat_iv.tq_avg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) tq_weighted_coding = batadv_nc_random_weight_tq(tq_tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) /* Select one destination for the MAC-header dst-field based on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) * weighted TQ-values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) if (tq_weighted_neigh >= tq_weighted_coding) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) /* Destination from nc_packet is selected for MAC-header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) first_dest = nc_packet->neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) first_source = nc_packet->nc_path->prev_hop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) second_dest = neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) second_source = ethhdr->h_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) packet2 = (struct batadv_unicast_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) packet_id1 = nc_packet->packet_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) packet_id2 = batadv_skb_crc32(skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) skb->data + sizeof(*packet2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) /* Destination for skb is selected for MAC-header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) first_dest = neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) first_source = ethhdr->h_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) second_dest = nc_packet->neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) second_source = nc_packet->nc_path->prev_hop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) packet1 = (struct batadv_unicast_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) packet_id1 = batadv_skb_crc32(skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) skb->data + sizeof(*packet1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) packet_id2 = nc_packet->packet_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) /* Instead of zero padding the smallest data buffer, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) * code into the largest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) if (skb->len <= nc_packet->skb->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) skb_dest = nc_packet->skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) skb_src = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) skb_dest = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) skb_src = nc_packet->skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) /* coding_len is used when decoding the packet shorter packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) coding_len = skb_src->len - unicast_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) skb_push(skb_dest, header_add);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) coded_packet = (struct batadv_coded_packet *)skb_dest->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) skb_reset_mac_header(skb_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) coded_packet->packet_type = BATADV_CODED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) coded_packet->version = BATADV_COMPAT_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) coded_packet->ttl = packet1->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) /* Info about first unicast packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) ether_addr_copy(coded_packet->first_source, first_source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) ether_addr_copy(coded_packet->first_orig_dest, packet1->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) coded_packet->first_crc = packet_id1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) coded_packet->first_ttvn = packet1->ttvn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) /* Info about second unicast packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) ether_addr_copy(coded_packet->second_dest, second_dest->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) ether_addr_copy(coded_packet->second_source, second_source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) ether_addr_copy(coded_packet->second_orig_dest, packet2->dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) coded_packet->second_crc = packet_id2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) coded_packet->second_ttl = packet2->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) coded_packet->second_ttvn = packet2->ttvn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) coded_packet->coded_len = htons(coding_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) /* This is where the magic happens: Code skb_src into skb_dest */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) batadv_nc_memxor(skb_dest->data + coded_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) skb_src->data + unicast_size, coding_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) /* Update counters accordingly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) if (BATADV_SKB_CB(skb_src)->decoded &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) BATADV_SKB_CB(skb_dest)->decoded) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) /* Both packets are recoded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) count = skb_src->len + ETH_HLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) count += skb_dest->len + ETH_HLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) } else if (!BATADV_SKB_CB(skb_src)->decoded &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) !BATADV_SKB_CB(skb_dest)->decoded) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) /* Both packets are newly coded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) count = skb_src->len + ETH_HLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) count += skb_dest->len + ETH_HLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) } else if (BATADV_SKB_CB(skb_src)->decoded &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) !BATADV_SKB_CB(skb_dest)->decoded) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) /* skb_src recoded and skb_dest is newly coded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) skb_src->len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) skb_dest->len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) } else if (!BATADV_SKB_CB(skb_src)->decoded &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) BATADV_SKB_CB(skb_dest)->decoded) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) /* skb_src is newly coded and skb_dest is recoded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) skb_src->len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) skb_dest->len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) /* skb_src is now coded into skb_dest, so free it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) consume_skb(skb_src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) /* avoid duplicate free of skb from nc_packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) nc_packet->skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) batadv_nc_packet_free(nc_packet, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) /* Send the coded packet and return true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) batadv_send_unicast_skb(skb_dest, first_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) res = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) if (router_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) batadv_neigh_node_put(router_neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) if (router_coding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) batadv_neigh_node_put(router_coding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) if (router_neigh_ifinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) batadv_neigh_ifinfo_put(router_neigh_ifinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) if (router_coding_ifinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) batadv_neigh_ifinfo_put(router_coding_ifinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) * batadv_nc_skb_coding_possible() - true if a decoded skb is available at dst.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) * @skb: data skb to forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) * @dst: destination mac address of the other skb to code with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) * @src: source mac address of skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) * Whenever we network code a packet we have to check whether we received it in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) * a network coded form. If so, we may not be able to use it for coding because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) * some neighbors may also have received (overheard) the packet in the network
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) * coded form without being able to decode it. It is hard to know which of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) * neighboring nodes was able to decode the packet, therefore we can only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) * re-code the packet if the source of the previous encoded packet is involved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) * Since the source encoded the packet we can be certain it has all necessary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) * decode information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) * Return: true if coding of a decoded packet is allowed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) * batadv_nc_path_search() - Find the coding path matching in_nc_node and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) * out_nc_node to retrieve a buffered packet that can be used for coding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) * @in_nc_node: pointer to skb next hop's neighbor nc node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) * @out_nc_node: pointer to skb source's neighbor nc node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) * @skb: data skb to forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) * @eth_dst: next hop mac address of skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) * Return: true if coding of a decoded skb is allowed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) static struct batadv_nc_packet *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) batadv_nc_path_search(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) struct batadv_nc_node *in_nc_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) struct batadv_nc_node *out_nc_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) u8 *eth_dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) struct batadv_nc_path *nc_path, nc_path_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) struct batadv_nc_packet *nc_packet_out = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) struct batadv_nc_packet *nc_packet, *nc_packet_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) struct batadv_hashtable *hash = bat_priv->nc.coding_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) if (!hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) /* Create almost path key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) out_nc_node->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) idx = batadv_nc_hash_choose(&nc_path_key, hash->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) /* Check for coding opportunities in this nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) spin_lock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) if (list_empty(&nc_path->packet_list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) spin_unlock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) list_for_each_entry_safe(nc_packet, nc_packet_tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) &nc_path->packet_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) if (!batadv_nc_skb_coding_possible(nc_packet->skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) eth_dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) in_nc_node->addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) /* Coding opportunity is found! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) list_del(&nc_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) nc_packet_out = nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) spin_unlock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) return nc_packet_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) * batadv_nc_skb_src_search() - Loops through the list of neighboring nodes of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) * the skb's sender (may be equal to the originator).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) * @skb: data skb to forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) * @eth_dst: next hop mac address of skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) * @eth_src: source mac address of skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) * @in_nc_node: pointer to skb next hop's neighbor nc node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) * Return: an nc packet if a suitable coding packet was found, NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) static struct batadv_nc_packet *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) batadv_nc_skb_src_search(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) u8 *eth_dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) u8 *eth_src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) struct batadv_nc_node *in_nc_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) struct batadv_orig_node *orig_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) struct batadv_nc_node *out_nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) struct batadv_nc_packet *nc_packet = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) orig_node = batadv_orig_hash_find(bat_priv, eth_src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) if (!orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) list_for_each_entry_rcu(out_nc_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) &orig_node->out_coding_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) /* Check if the skb is decoded and if recoding is possible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) if (!batadv_nc_skb_coding_possible(skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) out_nc_node->addr, eth_src))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) /* Search for an opportunity in this nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) nc_packet = batadv_nc_path_search(bat_priv, in_nc_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) out_nc_node, skb, eth_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) if (nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) batadv_orig_node_put(orig_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) return nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) * batadv_nc_skb_store_before_coding() - set the ethernet src and dst of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) * unicast skb before it is stored for use in later decoding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) * @skb: data skb to store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) * @eth_dst_new: new destination mac address of skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) u8 *eth_dst_new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) struct ethhdr *ethhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) /* Copy skb header to change the mac header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) /* Set the mac header as if we actually sent the packet uncoded */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) ethhdr = eth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) ether_addr_copy(ethhdr->h_source, ethhdr->h_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) ether_addr_copy(ethhdr->h_dest, eth_dst_new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) /* Set data pointer to MAC header to mimic packets from our tx path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) skb_push(skb, ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) /* Add the packet to the decoding packet pool */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) batadv_nc_skb_store_for_decoding(bat_priv, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) * our ref
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) * batadv_nc_skb_dst_search() - Loops through list of neighboring nodes to dst.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) * @skb: data skb to forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) * @neigh_node: next hop to forward packet to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) * @ethhdr: pointer to the ethernet header inside the skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) * Loops through the list of neighboring nodes the next hop has a good
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) * connection to (receives OGMs with a sufficient quality). We need to find a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) * neighbor of our next hop that potentially sent a packet which our next hop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) * also received (overheard) and has stored for later decoding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) * Return: true if the skb was consumed (encoded packet sent) or false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) static bool batadv_nc_skb_dst_search(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) struct batadv_neigh_node *neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) struct ethhdr *ethhdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) struct net_device *netdev = neigh_node->if_incoming->soft_iface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) struct batadv_priv *bat_priv = netdev_priv(netdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) struct batadv_orig_node *orig_node = neigh_node->orig_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) struct batadv_nc_node *nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) struct batadv_nc_packet *nc_packet = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) /* Search for coding opportunity with this in_nc_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) nc_packet = batadv_nc_skb_src_search(bat_priv, skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) neigh_node->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) ethhdr->h_source, nc_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) /* Opportunity was found, so stop searching */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) if (nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) if (!nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) /* Save packets for later decoding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) batadv_nc_skb_store_before_coding(bat_priv, skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) neigh_node->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) nc_packet->neigh_node->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) /* Code and send packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) neigh_node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) /* out of mem ? Coding failed - we have to free the buffered packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) * to avoid memleaks. The skb passed as argument will be dealt with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) * by the calling function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) batadv_nc_send_packet(nc_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) * batadv_nc_skb_add_to_path() - buffer skb for later encoding / decoding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) * @skb: skb to add to path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) * @nc_path: path to add skb to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) * @neigh_node: next hop to forward packet to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) * @packet_id: checksum to identify packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) * Return: true if the packet was buffered or false in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) static bool batadv_nc_skb_add_to_path(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) struct batadv_nc_path *nc_path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) struct batadv_neigh_node *neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) __be32 packet_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) struct batadv_nc_packet *nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) if (!nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) /* Initialize nc_packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) nc_packet->timestamp = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) nc_packet->packet_id = packet_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) nc_packet->skb = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) nc_packet->neigh_node = neigh_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) nc_packet->nc_path = nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) /* Add coding packet to list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) spin_lock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) list_add_tail(&nc_packet->list, &nc_path->packet_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) spin_unlock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) * batadv_nc_skb_forward() - try to code a packet or add it to the coding packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) * buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) * @skb: data skb to forward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) * @neigh_node: next hop to forward packet to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) * Return: true if the skb was consumed (encoded packet sent) or false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) bool batadv_nc_skb_forward(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) struct batadv_neigh_node *neigh_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) const struct net_device *netdev = neigh_node->if_incoming->soft_iface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) struct batadv_priv *bat_priv = netdev_priv(netdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) struct batadv_unicast_packet *packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) struct batadv_nc_path *nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) struct ethhdr *ethhdr = eth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) __be32 packet_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) u8 *payload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) /* Check if network coding is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) if (!atomic_read(&bat_priv->network_coding))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) /* We only handle unicast packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) payload = skb_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) packet = (struct batadv_unicast_packet *)payload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) if (packet->packet_type != BATADV_UNICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) /* Try to find a coding opportunity and send the skb if one is found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) /* Find or create a nc_path for this src-dst pair */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) nc_path = batadv_nc_get_path(bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) bat_priv->nc.coding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) ethhdr->h_source,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) neigh_node->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) if (!nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) /* Add skb to nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) goto free_nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) /* Packet is consumed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) free_nc_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) batadv_nc_path_put(nc_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) /* Packet is not consumed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) * batadv_nc_skb_store_for_decoding() - save a clone of the skb which can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) * used when decoding coded packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) * @skb: data skb to store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) struct batadv_unicast_packet *packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) struct batadv_nc_path *nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) struct ethhdr *ethhdr = eth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) __be32 packet_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) u8 *payload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) /* Check if network coding is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) if (!atomic_read(&bat_priv->network_coding))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) /* Check for supported packet type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) payload = skb_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) packet = (struct batadv_unicast_packet *)payload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) if (packet->packet_type != BATADV_UNICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) /* Find existing nc_path or create a new */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) nc_path = batadv_nc_get_path(bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) bat_priv->nc.decoding_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) ethhdr->h_source,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) ethhdr->h_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) if (!nc_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) /* Clone skb and adjust skb->data to point at batman header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) skb = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) if (unlikely(!skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) goto free_nc_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) /* Add skb to nc_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) free_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) free_nc_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) batadv_nc_path_put(nc_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) * batadv_nc_skb_store_sniffed_unicast() - check if a received unicast packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) * should be saved in the decoding buffer and, if so, store it there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) * @skb: unicast skb to store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) struct ethhdr *ethhdr = eth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) if (batadv_is_my_mac(bat_priv, ethhdr->h_dest))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) /* Set data pointer to MAC header to mimic packets from our tx path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) skb_push(skb, ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) batadv_nc_skb_store_for_decoding(bat_priv, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) * batadv_nc_skb_decode_packet() - decode given skb using the decode data stored
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) * in nc_packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) * @skb: unicast skb to decode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) * @nc_packet: decode data needed to decode the skb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) * Return: pointer to decoded unicast packet if the packet was decoded or NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) * in case of an error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) static struct batadv_unicast_packet *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) struct batadv_nc_packet *nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) const int h_size = sizeof(struct batadv_unicast_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) const int h_diff = sizeof(struct batadv_coded_packet) - h_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) struct batadv_unicast_packet *unicast_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) struct batadv_coded_packet coded_packet_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) struct ethhdr *ethhdr, ethhdr_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) u8 *orig_dest, ttl, ttvn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) unsigned int coding_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) /* Save headers temporarily */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) if (skb_cow(skb, 0) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) if (unlikely(!skb_pull_rcsum(skb, h_diff)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) /* Data points to batman header, so set mac header 14 bytes before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) * and network to data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) skb_set_mac_header(skb, -ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) /* Reconstruct original mac header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) ethhdr = eth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) *ethhdr = ethhdr_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) /* Select the correct unicast header information based on the location
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) * of our mac address in the coded_packet header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) /* If we are the second destination the packet was overheard,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) * so the Ethernet address must be copied to h_dest and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) skb->pkt_type = PACKET_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) orig_dest = coded_packet_tmp.second_orig_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) ttl = coded_packet_tmp.second_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) ttvn = coded_packet_tmp.second_ttvn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) orig_dest = coded_packet_tmp.first_orig_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) ttl = coded_packet_tmp.ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) ttvn = coded_packet_tmp.first_ttvn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) coding_len = ntohs(coded_packet_tmp.coded_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) if (coding_len > skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) /* Here the magic is reversed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) * extract the missing packet from the received coded packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) batadv_nc_memxor(skb->data + h_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) nc_packet->skb->data + h_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) coding_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) /* Resize decoded skb if decoded with larger packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) if (nc_packet->skb->len > coding_len + h_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) err = pskb_trim_rcsum(skb, coding_len + h_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) /* Create decoded unicast packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) unicast_packet = (struct batadv_unicast_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) unicast_packet->packet_type = BATADV_UNICAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) unicast_packet->version = BATADV_COMPAT_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) unicast_packet->ttl = ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) ether_addr_copy(unicast_packet->dest, orig_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) unicast_packet->ttvn = ttvn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) batadv_nc_packet_free(nc_packet, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) return unicast_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) * batadv_nc_find_decoding_packet() - search through buffered decoding data to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) * find the data needed to decode the coded packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) * @ethhdr: pointer to the ethernet header inside the coded packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) * @coded: coded packet we try to find decode data for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) * Return: pointer to nc packet if the needed data was found or NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) static struct batadv_nc_packet *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) struct ethhdr *ethhdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) struct batadv_coded_packet *coded)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) struct batadv_hashtable *hash = bat_priv->nc.decoding_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) struct batadv_nc_path *nc_path, nc_path_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) u8 *dest, *source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) __be32 packet_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) if (!hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) /* Select the correct packet id based on the location of our mac-addr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) dest = ethhdr->h_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) if (!batadv_is_my_mac(bat_priv, coded->second_dest)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) source = coded->second_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) packet_id = coded->second_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) source = coded->first_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) packet_id = coded->first_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) batadv_nc_hash_key_gen(&nc_path_key, source, dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) index = batadv_nc_hash_choose(&nc_path_key, hash->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) /* Search for matching coding path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) /* Find matching nc_packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) spin_lock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) list_for_each_entry(tmp_nc_packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) &nc_path->packet_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) if (packet_id == tmp_nc_packet->packet_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) list_del(&tmp_nc_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) nc_packet = tmp_nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) spin_unlock_bh(&nc_path->packet_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) if (nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) if (!nc_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) batadv_dbg(BATADV_DBG_NC, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) "No decoding packet found for %u\n", packet_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) return nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) * batadv_nc_recv_coded_packet() - try to decode coded packet and enqueue the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) * resulting unicast packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) * @skb: incoming coded packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) * @recv_if: pointer to interface this packet was received on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) * otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) struct batadv_hard_iface *recv_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) struct batadv_unicast_packet *unicast_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) struct batadv_coded_packet *coded_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) struct batadv_nc_packet *nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) struct ethhdr *ethhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) int hdr_size = sizeof(*coded_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) /* Check if network coding is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) if (!atomic_read(&bat_priv->network_coding))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) /* Make sure we can access (and remove) header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) if (unlikely(!pskb_may_pull(skb, hdr_size)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) coded_packet = (struct batadv_coded_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) ethhdr = eth_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) /* Verify frame is destined for us */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) !batadv_is_my_mac(bat_priv, coded_packet->second_dest))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) /* Update stat counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) if (batadv_is_my_mac(bat_priv, coded_packet->second_dest))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) coded_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) if (!nc_packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) /* Make skb's linear, because decoding accesses the entire buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) if (skb_linearize(skb) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) goto free_nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) if (skb_linearize(nc_packet->skb) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) goto free_nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) /* Decode the packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) if (!unicast_packet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) goto free_nc_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) /* Mark packet as decoded to do correct recoding when forwarding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) BATADV_SKB_CB(skb)->decoded = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) skb->len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) return batadv_recv_unicast_packet(skb, recv_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) free_nc_packet:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) batadv_nc_packet_free(nc_packet, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) free_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) * batadv_nc_mesh_free() - clean up network coding memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) void batadv_nc_mesh_free(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_NC, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) cancel_delayed_work_sync(&bat_priv->nc.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) batadv_hash_destroy(bat_priv->nc.coding_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) batadv_hash_destroy(bat_priv->nc.decoding_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) #ifdef CONFIG_BATMAN_ADV_DEBUGFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) * batadv_nc_nodes_seq_print_text() - print the nc node information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) * @seq: seq file to print on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) * @offset: not used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) * Return: always 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) struct net_device *net_dev = (struct net_device *)seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) struct batadv_priv *bat_priv = netdev_priv(net_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) struct batadv_hashtable *hash = bat_priv->orig_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) struct batadv_hard_iface *primary_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) struct hlist_head *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) struct batadv_orig_node *orig_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) struct batadv_nc_node *nc_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) primary_if = batadv_seq_print_text_primary_if_get(seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) if (!primary_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) /* Traverse list of originators */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) for (i = 0; i < hash->size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) head = &hash->table[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915) /* For each orig_node in this bin */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) /* no need to print the orig node if it does not have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) * network coding neighbors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) if (list_empty(&orig_node->in_coding_list) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) list_empty(&orig_node->out_coding_list))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) seq_printf(seq, "Node: %pM\n", orig_node->orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) seq_puts(seq, " Ingoing: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928) /* For each in_nc_node to this orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) list_for_each_entry_rcu(nc_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) &orig_node->in_coding_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) seq_printf(seq, "%pM ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933) nc_node->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) seq_puts(seq, "\n Outgoing: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) /* For out_nc_node to this orig_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) list_for_each_entry_rcu(nc_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) &orig_node->out_coding_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) seq_printf(seq, "%pM ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) nc_node->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) seq_puts(seq, "\n\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) if (primary_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) batadv_hardif_put(primary_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) * batadv_nc_init_debugfs() - create nc folder and related files in debugfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956) void batadv_nc_init_debugfs(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) struct dentry *nc_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) debugfs_create_u8("min_tq", 0644, nc_dir, &bat_priv->nc.min_tq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) debugfs_create_u32("max_fwd_delay", 0644, nc_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) &bat_priv->nc.max_fwd_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) debugfs_create_u32("max_buffer_time", 0644, nc_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) &bat_priv->nc.max_buffer_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags