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/core/dst.c | 103 +++++++++++++++++++++++++++++----------------------
1 files changed, 58 insertions(+), 45 deletions(-)
diff --git a/kernel/net/core/dst.c b/kernel/net/core/dst.c
index 81ccf20..fb3bcba 100644
--- a/kernel/net/core/dst.c
+++ b/kernel/net/core/dst.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* net/core/dst.c Protocol independent destination cache.
*
@@ -26,23 +27,6 @@
#include <net/dst.h>
#include <net/dst_metadata.h>
-/*
- * Theory of operations:
- * 1) We use a list, protected by a spinlock, to add
- * new entries from both BH and non-BH context.
- * 2) In order to keep spinlock held for a small delay,
- * we use a second list where are stored long lived
- * entries, that are handled by the garbage collect thread
- * fired by a workqueue.
- * 3) This list is guarded by a mutex,
- * so that the gc_task and dst_dev_event() can be synchronized.
- */
-
-/*
- * We want to keep lock & list close together
- * to dirty as few cache lines as possible in __dst_free().
- * As this is not a very strong hint, we dont force an alignment on SMP.
- */
int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
kfree_skb(skb);
@@ -97,9 +81,13 @@
{
struct dst_entry *dst;
- if (ops->gc && dst_entries_get_fast(ops) > ops->gc_thresh) {
- if (ops->gc(ops))
+ if (ops->gc &&
+ !(flags & DST_NOCOUNT) &&
+ dst_entries_get_fast(ops) > ops->gc_thresh) {
+ if (ops->gc(ops)) {
+ pr_notice_ratelimited("Route cache is full: consider increasing sysctl net.ipv6.route.max_size.\n");
return NULL;
+ }
}
dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC);
@@ -156,7 +144,7 @@
/* Operations to mark dst as DEAD and clean up the net device referenced
* by dst:
- * 1. put the dst under loopback interface and discard all tx/rx packets
+ * 1. put the dst under blackhole interface and discard all tx/rx packets
* on this route.
* 2. release the net_device
* This function should be called when removing routes from the fib tree
@@ -172,7 +160,7 @@
dst->ops->ifdown(dst, dev, true);
dst->input = dst_discard;
dst->output = dst_discard_out;
- dst->dev = dev_net(dst->dev)->loopback_dev;
+ dst->dev = blackhole_netdev;
dev_hold(dst->dev);
dev_put(dev);
}
@@ -184,7 +172,7 @@
int newrefcnt;
newrefcnt = atomic_dec_return(&dst->__refcnt);
- if (unlikely(newrefcnt < 0))
+ if (WARN_ONCE(newrefcnt < 0, "dst_release underflow"))
net_warn_ratelimited("%s: dst:%p refcnt:%d\n",
__func__, dst, newrefcnt);
if (!newrefcnt)
@@ -199,7 +187,7 @@
int newrefcnt;
newrefcnt = atomic_dec_return(&dst->__refcnt);
- if (unlikely(newrefcnt < 0))
+ if (WARN_ONCE(newrefcnt < 0, "dst_release_immediate underflow"))
net_warn_ratelimited("%s: dst:%p refcnt:%d\n",
__func__, dst, newrefcnt);
if (!newrefcnt)
@@ -249,37 +237,62 @@
}
EXPORT_SYMBOL(__dst_destroy_metrics_generic);
-static struct dst_ops md_dst_ops = {
- .family = AF_UNSPEC,
+struct dst_entry *dst_blackhole_check(struct dst_entry *dst, u32 cookie)
+{
+ return NULL;
+}
+
+u32 *dst_blackhole_cow_metrics(struct dst_entry *dst, unsigned long old)
+{
+ return NULL;
+}
+
+struct neighbour *dst_blackhole_neigh_lookup(const struct dst_entry *dst,
+ struct sk_buff *skb,
+ const void *daddr)
+{
+ return NULL;
+}
+
+void dst_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb, u32 mtu,
+ bool confirm_neigh)
+{
+}
+EXPORT_SYMBOL_GPL(dst_blackhole_update_pmtu);
+
+void dst_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
+ struct sk_buff *skb)
+{
+}
+EXPORT_SYMBOL_GPL(dst_blackhole_redirect);
+
+unsigned int dst_blackhole_mtu(const struct dst_entry *dst)
+{
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ return mtu ? : dst->dev->mtu;
+}
+EXPORT_SYMBOL_GPL(dst_blackhole_mtu);
+
+static struct dst_ops dst_blackhole_ops = {
+ .family = AF_UNSPEC,
+ .neigh_lookup = dst_blackhole_neigh_lookup,
+ .check = dst_blackhole_check,
+ .cow_metrics = dst_blackhole_cow_metrics,
+ .update_pmtu = dst_blackhole_update_pmtu,
+ .redirect = dst_blackhole_redirect,
+ .mtu = dst_blackhole_mtu,
};
-
-static int dst_md_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
- WARN_ONCE(1, "Attempting to call output on metadata dst\n");
- kfree_skb(skb);
- return 0;
-}
-
-static int dst_md_discard(struct sk_buff *skb)
-{
- WARN_ONCE(1, "Attempting to call input on metadata dst\n");
- kfree_skb(skb);
- return 0;
-}
static void __metadata_dst_init(struct metadata_dst *md_dst,
enum metadata_type type, u8 optslen)
-
{
struct dst_entry *dst;
dst = &md_dst->dst;
- dst_init(dst, &md_dst_ops, NULL, 1, DST_OBSOLETE_NONE,
+ dst_init(dst, &dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE,
DST_METADATA | DST_NOCOUNT);
-
- dst->input = dst_md_discard;
- dst->output = dst_md_discard_out;
-
memset(dst + 1, 0, sizeof(*md_dst) + optslen - sizeof(*dst));
md_dst->type = type;
}
--
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