[PATCH v3] net: Remove low_thresh in ip defrag
From: Angus Chen
Date: Tue May 16 2023 - 20:19:02 EST
As low_thresh has no work in fragment reassembles,mark it to be unused.
And Mark it deprecated in sysctl Document.
Signed-off-by: Angus Chen <angus.chen@xxxxxxxxxxxxxxx>
---
v2:
Fix some spelling errors,and remove low_thresh from struct fqdir.
suggested by Jakub Kicinski <kuba@xxxxxxxxxx>.
v3:
Change low_thresh to low_thresh_unused in struct fqdir.
Documentation/networking/nf_conntrack-sysctl.rst | 1 +
include/net/inet_frag.h | 5 ++++-
net/ieee802154/6lowpan/reassembly.c | 6 +++---
net/ipv4/ip_fragment.c | 10 ++++------
net/ipv6/netfilter/nf_conntrack_reasm.c | 6 +++---
net/ipv6/reassembly.c | 6 +++---
6 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst
index 8b1045c3b59e..9ca356bc7217 100644
--- a/Documentation/networking/nf_conntrack-sysctl.rst
+++ b/Documentation/networking/nf_conntrack-sysctl.rst
@@ -55,6 +55,7 @@ nf_conntrack_frag6_high_thresh - INTEGER
nf_conntrack_frag6_low_thresh is reached.
nf_conntrack_frag6_low_thresh - INTEGER
+ (Obsolete since linux-4.17)
default 196608
See nf_conntrack_frag6_low_thresh
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index b23ddec3cd5c..6ef360e4b729 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -13,7 +13,10 @@
struct fqdir {
/* sysctls */
long high_thresh;
- long low_thresh;
+ /* low_thresh is unused since linux-4.17,
+ * keep it just to avoid getting warning from ensure_safe_net_sysctl.
+ */
+ long low_thresh_unused;
int timeout;
int max_dist;
struct inet_frags *f;
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index a91283d1e5bf..c46cbe001646 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -374,8 +374,8 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
}
table[0].data = &ieee802154_lowpan->fqdir->high_thresh;
- table[0].extra1 = &ieee802154_lowpan->fqdir->low_thresh;
- table[1].data = &ieee802154_lowpan->fqdir->low_thresh;
+ table[0].extra1 = &ieee802154_lowpan->fqdir->low_thresh_unused;
+ table[1].data = &ieee802154_lowpan->fqdir->low_thresh_unused;
table[1].extra2 = &ieee802154_lowpan->fqdir->high_thresh;
table[2].data = &ieee802154_lowpan->fqdir->timeout;
@@ -451,7 +451,7 @@ static int __net_init lowpan_frags_init_net(struct net *net)
return res;
ieee802154_lowpan->fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH;
- ieee802154_lowpan->fqdir->low_thresh = IPV6_FRAG_LOW_THRESH;
+ ieee802154_lowpan->fqdir->low_thresh_unused = IPV6_FRAG_LOW_THRESH;
ieee802154_lowpan->fqdir->timeout = IPV6_FRAG_TIMEOUT;
res = lowpan_frags_ns_sysctl_register(net);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 69c00ffdcf3e..9d72673b048b 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -609,8 +609,8 @@ static int __net_init ip4_frags_ns_ctl_register(struct net *net)
}
table[0].data = &net->ipv4.fqdir->high_thresh;
- table[0].extra1 = &net->ipv4.fqdir->low_thresh;
- table[1].data = &net->ipv4.fqdir->low_thresh;
+ table[0].extra1 = &net->ipv4.fqdir->low_thresh_unused;
+ table[1].data = &net->ipv4.fqdir->low_thresh_unused;
table[1].extra2 = &net->ipv4.fqdir->high_thresh;
table[2].data = &net->ipv4.fqdir->timeout;
table[3].data = &net->ipv4.fqdir->max_dist;
@@ -674,12 +674,10 @@ static int __net_init ipv4_frags_init_net(struct net *net)
* A 64K fragment consumes 129736 bytes (44*2944)+200
* (1500 truesize == 2944, sizeof(struct ipq) == 200)
*
- * We will commit 4MB at one time. Should we cross that limit
- * we will prune down to 3MB, making room for approx 8 big 64K
- * fragments 8x128k.
+ * We will commit 4MB at one time. And mark low_thresh be unused.
*/
net->ipv4.fqdir->high_thresh = 4 * 1024 * 1024;
- net->ipv4.fqdir->low_thresh = 3 * 1024 * 1024;
+ net->ipv4.fqdir->low_thresh_unused = 3 * 1024 * 1024;
/*
* Important NOTE! Fragment queue must be destroyed before MSL expires.
* RFC791 is wrong proposing to prolongate timer each fragment arrival
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index d13240f13607..013f16ecdcd1 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -82,10 +82,10 @@ static int nf_ct_frag6_sysctl_register(struct net *net)
nf_frag = nf_frag_pernet(net);
table[0].data = &nf_frag->fqdir->timeout;
- table[1].data = &nf_frag->fqdir->low_thresh;
+ table[1].data = &nf_frag->fqdir->low_thresh_unused;
table[1].extra2 = &nf_frag->fqdir->high_thresh;
table[2].data = &nf_frag->fqdir->high_thresh;
- table[2].extra1 = &nf_frag->fqdir->low_thresh;
+ table[2].extra1 = &nf_frag->fqdir->low_thresh_unused;
hdr = register_net_sysctl(net, "net/netfilter", table);
if (hdr == NULL)
@@ -500,7 +500,7 @@ static int nf_ct_net_init(struct net *net)
return res;
nf_frag->fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH;
- nf_frag->fqdir->low_thresh = IPV6_FRAG_LOW_THRESH;
+ nf_frag->fqdir->low_thresh_unused = IPV6_FRAG_LOW_THRESH;
nf_frag->fqdir->timeout = IPV6_FRAG_TIMEOUT;
res = nf_ct_frag6_sysctl_register(net);
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 5bc8a28e67f9..59b3fc8d9e6b 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -465,8 +465,8 @@ static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
}
table[0].data = &net->ipv6.fqdir->high_thresh;
- table[0].extra1 = &net->ipv6.fqdir->low_thresh;
- table[1].data = &net->ipv6.fqdir->low_thresh;
+ table[0].extra1 = &net->ipv6.fqdir->low_thresh_unused;
+ table[1].data = &net->ipv6.fqdir->low_thresh_unused;
table[1].extra2 = &net->ipv6.fqdir->high_thresh;
table[2].data = &net->ipv6.fqdir->timeout;
@@ -536,7 +536,7 @@ static int __net_init ipv6_frags_init_net(struct net *net)
return res;
net->ipv6.fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH;
- net->ipv6.fqdir->low_thresh = IPV6_FRAG_LOW_THRESH;
+ net->ipv6.fqdir->low_thresh_unused = IPV6_FRAG_LOW_THRESH;
net->ipv6.fqdir->timeout = IPV6_FRAG_TIMEOUT;
res = ip6_frags_ns_sysctl_register(net);
--
2.25.1