From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/net/batman-adv/bridge_loop_avoidance.c | 113 +++++++++++++++++++++++++++++---------------------------
1 files changed, 58 insertions(+), 55 deletions(-)
diff --git a/kernel/net/batman-adv/bridge_loop_avoidance.c b/kernel/net/batman-adv/bridge_loop_avoidance.c
index b9e61fc..986f707 100644
--- a/kernel/net/batman-adv/bridge_loop_avoidance.c
+++ b/kernel/net/batman-adv/bridge_loop_avoidance.c
@@ -1,19 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors:
+/* Copyright (C) 2011-2020 B.A.T.M.A.N. contributors:
*
* Simon Wunderlich
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "bridge_loop_avoidance.h"
@@ -60,7 +48,6 @@
#include "netlink.h"
#include "originator.h"
#include "soft-interface.h"
-#include "sysfs.h"
#include "translation-table.h"
static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
@@ -177,6 +164,9 @@
*/
static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
{
+ if (!backbone_gw)
+ return;
+
kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
}
@@ -212,6 +202,9 @@
*/
static void batadv_claim_put(struct batadv_bla_claim *claim)
{
+ if (!claim)
+ return;
+
kref_put(&claim->refcount, batadv_claim_release);
}
@@ -862,7 +855,7 @@
/* handle as ANNOUNCE frame */
backbone_gw->lasttime = jiffies;
- crc = ntohs(*((__be16 *)(&an_addr[4])));
+ crc = ntohs(*((__force __be16 *)(&an_addr[4])));
batadv_dbg(BATADV_DBG_BLA, bat_priv,
"%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
@@ -1010,7 +1003,7 @@
* @hw_dst: the Hardware destination in the ARP Header
* @ethhdr: pointer to the Ethernet header of the claim frame
*
- * checks if it is a claim packet and if its on the same group.
+ * checks if it is a claim packet and if it's on the same group.
* This function also applies the group ID of the sender
* if it is in the same mesh.
*
@@ -1842,7 +1835,7 @@
* @vid: the VLAN ID of the frame
*
* Checks if this packet is a loop detect frame which has been sent by us,
- * throw an uevent and log the event if that is the case.
+ * throws an uevent and logs the event if that is the case.
*
* Return: true if it is a loop detect frame which is to be dropped, false
* otherwise.
@@ -1880,7 +1873,7 @@
ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work);
- /* backbone_gw is unreferenced in the report work function function
+ /* backbone_gw is unreferenced in the report work function
* if queue_work() call was successful
*/
if (!ret)
@@ -1900,7 +1893,7 @@
* * we have to race for a claim
* * if the frame is allowed on the LAN
*
- * in these cases, the skb is further handled by this function
+ * In these cases, the skb is further handled by this function
*
* Return: true if handled, otherwise it returns false and the caller shall
* further process the skb.
@@ -2200,14 +2193,15 @@
* to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
- * @seq: Sequence number of netlink message
+ * @cb: Control block containing additional options
* @primary_if: primary interface
* @claim: entry to dump
*
* Return: 0 or error code.
*/
static int
-batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid,
+ struct netlink_callback *cb,
struct batadv_hard_iface *primary_if,
struct batadv_bla_claim *claim)
{
@@ -2217,12 +2211,15 @@
void *hdr;
int ret = -EINVAL;
- hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
- NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
+ hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
+ &batadv_netlink_family, NLM_F_MULTI,
+ BATADV_CMD_GET_BLA_CLAIM);
if (!hdr) {
ret = -ENOBUFS;
goto out;
}
+
+ genl_dump_check_consistent(cb, hdr);
is_own = batadv_compare_eth(claim->backbone_gw->orig,
primary_addr);
@@ -2259,28 +2256,33 @@
* to a netlink socket
* @msg: buffer for the message
* @portid: netlink port
- * @seq: Sequence number of netlink message
+ * @cb: Control block containing additional options
* @primary_if: primary interface
- * @head: bucket to dump
+ * @hash: hash to dump
+ * @bucket: bucket index to dump
* @idx_skip: How many entries to skip
*
* Return: always 0.
*/
static int
-batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
+batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid,
+ struct netlink_callback *cb,
struct batadv_hard_iface *primary_if,
- struct hlist_head *head, int *idx_skip)
+ struct batadv_hashtable *hash, unsigned int bucket,
+ int *idx_skip)
{
struct batadv_bla_claim *claim;
int idx = 0;
int ret = 0;
- rcu_read_lock();
- hlist_for_each_entry_rcu(claim, head, hash_entry) {
+ spin_lock_bh(&hash->list_locks[bucket]);
+ cb->seq = atomic_read(&hash->generation) << 1 | 1;
+
+ hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) {
if (idx++ < *idx_skip)
continue;
- ret = batadv_bla_claim_dump_entry(msg, portid, seq,
+ ret = batadv_bla_claim_dump_entry(msg, portid, cb,
primary_if, claim);
if (ret) {
*idx_skip = idx - 1;
@@ -2290,7 +2292,7 @@
*idx_skip = 0;
unlock:
- rcu_read_unlock();
+ spin_unlock_bh(&hash->list_locks[bucket]);
return ret;
}
@@ -2310,7 +2312,6 @@
struct batadv_hashtable *hash;
struct batadv_priv *bat_priv;
int bucket = cb->args[0];
- struct hlist_head *head;
int idx = cb->args[1];
int ifindex;
int ret = 0;
@@ -2336,11 +2337,8 @@
}
while (bucket < hash->size) {
- head = &hash->table[bucket];
-
- if (batadv_bla_claim_dump_bucket(msg, portid,
- cb->nlh->nlmsg_seq,
- primary_if, head, &idx))
+ if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if,
+ hash, bucket, &idx))
break;
bucket++;
}
@@ -2431,14 +2429,15 @@
* netlink socket
* @msg: buffer for the message
* @portid: netlink port
- * @seq: Sequence number of netlink message
+ * @cb: Control block containing additional options
* @primary_if: primary interface
* @backbone_gw: entry to dump
*
* Return: 0 or error code.
*/
static int
-batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid,
+ struct netlink_callback *cb,
struct batadv_hard_iface *primary_if,
struct batadv_bla_backbone_gw *backbone_gw)
{
@@ -2449,12 +2448,15 @@
void *hdr;
int ret = -EINVAL;
- hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
- NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE);
+ hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
+ &batadv_netlink_family, NLM_F_MULTI,
+ BATADV_CMD_GET_BLA_BACKBONE);
if (!hdr) {
ret = -ENOBUFS;
goto out;
}
+
+ genl_dump_check_consistent(cb, hdr);
is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
@@ -2492,28 +2494,33 @@
* a netlink socket
* @msg: buffer for the message
* @portid: netlink port
- * @seq: Sequence number of netlink message
+ * @cb: Control block containing additional options
* @primary_if: primary interface
- * @head: bucket to dump
+ * @hash: hash to dump
+ * @bucket: bucket index to dump
* @idx_skip: How many entries to skip
*
* Return: always 0.
*/
static int
-batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
+batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid,
+ struct netlink_callback *cb,
struct batadv_hard_iface *primary_if,
- struct hlist_head *head, int *idx_skip)
+ struct batadv_hashtable *hash,
+ unsigned int bucket, int *idx_skip)
{
struct batadv_bla_backbone_gw *backbone_gw;
int idx = 0;
int ret = 0;
- rcu_read_lock();
- hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
+ spin_lock_bh(&hash->list_locks[bucket]);
+ cb->seq = atomic_read(&hash->generation) << 1 | 1;
+
+ hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) {
if (idx++ < *idx_skip)
continue;
- ret = batadv_bla_backbone_dump_entry(msg, portid, seq,
+ ret = batadv_bla_backbone_dump_entry(msg, portid, cb,
primary_if, backbone_gw);
if (ret) {
*idx_skip = idx - 1;
@@ -2523,7 +2530,7 @@
*idx_skip = 0;
unlock:
- rcu_read_unlock();
+ spin_unlock_bh(&hash->list_locks[bucket]);
return ret;
}
@@ -2543,7 +2550,6 @@
struct batadv_hashtable *hash;
struct batadv_priv *bat_priv;
int bucket = cb->args[0];
- struct hlist_head *head;
int idx = cb->args[1];
int ifindex;
int ret = 0;
@@ -2569,11 +2575,8 @@
}
while (bucket < hash->size) {
- head = &hash->table[bucket];
-
- if (batadv_bla_backbone_dump_bucket(msg, portid,
- cb->nlh->nlmsg_seq,
- primary_if, head, &idx))
+ if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if,
+ hash, bucket, &idx))
break;
bucket++;
}
--
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