From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/net/ipv6/anycast.c | 94 +++++++++++++++++++++++++++++++++++++++++------
1 files changed, 82 insertions(+), 12 deletions(-)
diff --git a/kernel/net/ipv6/anycast.c b/kernel/net/ipv6/anycast.c
index 55fbe33..dacdea7 100644
--- a/kernel/net/ipv6/anycast.c
+++ b/kernel/net/ipv6/anycast.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Anycast support for IPv6
* Linux INET6 implementation
@@ -6,11 +7,6 @@
* David L Stevens (dlstevens@us.ibm.com)
*
* based heavily on net/ipv6/mcast.c
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#include <linux/capability.h>
@@ -44,7 +40,21 @@
#include <net/checksum.h>
+#define IN6_ADDR_HSIZE_SHIFT 8
+#define IN6_ADDR_HSIZE BIT(IN6_ADDR_HSIZE_SHIFT)
+/* anycast address hash table
+ */
+static struct hlist_head inet6_acaddr_lst[IN6_ADDR_HSIZE];
+static DEFINE_SPINLOCK(acaddr_hash_lock);
+
static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
+
+static u32 inet6_acaddr_hash(struct net *net, const struct in6_addr *addr)
+{
+ u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
+
+ return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
+}
/*
* socket join an anycast group
@@ -211,16 +221,39 @@
rtnl_unlock();
}
+static void ipv6_add_acaddr_hash(struct net *net, struct ifacaddr6 *aca)
+{
+ unsigned int hash = inet6_acaddr_hash(net, &aca->aca_addr);
+
+ spin_lock(&acaddr_hash_lock);
+ hlist_add_head_rcu(&aca->aca_addr_lst, &inet6_acaddr_lst[hash]);
+ spin_unlock(&acaddr_hash_lock);
+}
+
+static void ipv6_del_acaddr_hash(struct ifacaddr6 *aca)
+{
+ spin_lock(&acaddr_hash_lock);
+ hlist_del_init_rcu(&aca->aca_addr_lst);
+ spin_unlock(&acaddr_hash_lock);
+}
+
static void aca_get(struct ifacaddr6 *aca)
{
refcount_inc(&aca->aca_refcnt);
}
+static void aca_free_rcu(struct rcu_head *h)
+{
+ struct ifacaddr6 *aca = container_of(h, struct ifacaddr6, rcu);
+
+ fib6_info_release(aca->aca_rt);
+ kfree(aca);
+}
+
static void aca_put(struct ifacaddr6 *ac)
{
if (refcount_dec_and_test(&ac->aca_refcnt)) {
- fib6_info_release(ac->aca_rt);
- kfree(ac);
+ call_rcu(&ac->rcu, aca_free_rcu);
}
}
@@ -236,6 +269,7 @@
aca->aca_addr = *addr;
fib6_info_hold(f6i);
aca->aca_rt = f6i;
+ INIT_HLIST_NODE(&aca->aca_addr_lst);
aca->aca_users = 1;
/* aca_tstamp should be updated upon changes */
aca->aca_cstamp = aca->aca_tstamp = jiffies;
@@ -292,6 +326,8 @@
aca_get(aca);
write_unlock_bh(&idev->lock);
+ ipv6_add_acaddr_hash(net, aca);
+
ip6_ins_rt(net, f6i);
addrconf_join_solict(idev->dev, &aca->aca_addr);
@@ -332,9 +368,10 @@
else
idev->ac_list = aca->aca_next;
write_unlock_bh(&idev->lock);
+ ipv6_del_acaddr_hash(aca);
addrconf_leave_solict(idev, &aca->aca_addr);
- ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
+ ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
aca_put(aca);
return 0;
@@ -359,9 +396,11 @@
idev->ac_list = aca->aca_next;
write_unlock_bh(&idev->lock);
+ ipv6_del_acaddr_hash(aca);
+
addrconf_leave_solict(idev, &aca->aca_addr);
- ip6_del_rt(dev_net(idev->dev), aca->aca_rt);
+ ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
aca_put(aca);
@@ -397,17 +436,27 @@
bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
const struct in6_addr *addr)
{
+ struct net_device *nh_dev;
+ struct ifacaddr6 *aca;
bool found = false;
rcu_read_lock();
if (dev)
found = ipv6_chk_acast_dev(dev, addr);
- else
- for_each_netdev_rcu(net, dev)
- if (ipv6_chk_acast_dev(dev, addr)) {
+ else {
+ unsigned int hash = inet6_acaddr_hash(net, addr);
+
+ hlist_for_each_entry_rcu(aca, &inet6_acaddr_lst[hash],
+ aca_addr_lst) {
+ nh_dev = fib6_info_nh_dev(aca->aca_rt);
+ if (!nh_dev || !net_eq(dev_net(nh_dev), net))
+ continue;
+ if (ipv6_addr_equal(&aca->aca_addr, addr)) {
found = true;
break;
}
+ }
+ }
rcu_read_unlock();
return found;
}
@@ -547,3 +596,24 @@
remove_proc_entry("anycast6", net->proc_net);
}
#endif
+
+/* Init / cleanup code
+ */
+int __init ipv6_anycast_init(void)
+{
+ int i;
+
+ for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ INIT_HLIST_HEAD(&inet6_acaddr_lst[i]);
+ return 0;
+}
+
+void ipv6_anycast_cleanup(void)
+{
+ int i;
+
+ spin_lock(&acaddr_hash_lock);
+ for (i = 0; i < IN6_ADDR_HSIZE; i++)
+ WARN_ON(!hlist_empty(&inet6_acaddr_lst[i]));
+ spin_unlock(&acaddr_hash_lock);
+}
--
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