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qubes-linux-kernel/patches.suse/SoN-16-netvm-reserve-inet.p...

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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: [PATCH 16/31] netvm: INET reserves.
Patch-mainline: Not yet
Add reserves for INET.
The two big users seem to be the route cache and ip-fragment cache.
Reserve the route cache under generic RX reserve, its usage is bounded by
the high reclaim watermark, and thus does not need further accounting.
Reserve the ip-fragement caches under SKB data reserve, these add to the
SKB RX limit. By ensuring we can at least receive as much data as fits in
the reassmbly line we avoid fragment attack deadlocks.
Adds to the reserve tree:
total network reserve
network TX reserve
protocol TX pages
network RX reserve
+ IPv6 route cache
+ IPv4 route cache
SKB data reserve
+ IPv6 fragment cache
+ IPv4 fragment cache
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
---
include/net/inet_frag.h | 7 +++++
include/net/netns/ipv6.h | 4 +++
net/ipv4/inet_fragment.c | 3 ++
net/ipv4/ip_fragment.c | 56 +++++++++++++++++++++++++++++++++++++++++++--
net/ipv4/route.c | 58 +++++++++++++++++++++++++++++++++++++++++++++--
net/ipv6/reassembly.c | 55 ++++++++++++++++++++++++++++++++++++++++++--
net/ipv6/route.c | 47 ++++++++++++++++++++++++++++++++++++--
7 files changed, 222 insertions(+), 8 deletions(-)
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -1,6 +1,9 @@
#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__
+#include <linux/reserve.h>
+#include <linux/mutex.h>
+
struct netns_frags {
int nqueues;
atomic_t mem;
@@ -10,6 +13,10 @@ struct netns_frags {
int timeout;
int high_thresh;
int low_thresh;
+
+ /* reserves */
+ struct mutex lock;
+ struct mem_reserve reserve;
};
struct inet_frag_queue {
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -25,6 +25,8 @@ struct netns_sysctl_ipv6 {
int ip6_rt_mtu_expires;
int ip6_rt_min_advmss;
int icmpv6_time;
+
+ struct mutex ip6_rt_lock;
};
struct netns_ipv6 {
@@ -58,6 +60,8 @@ struct netns_ipv6 {
struct sock *ndisc_sk;
struct sock *tcp_sk;
struct sock *igmp_sk;
+
+ struct mem_reserve ip6_rt_reserve;
#ifdef CONFIG_IPV6_MROUTE
#ifndef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
struct mr6_table *mrt6;
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -20,6 +20,7 @@
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
+#include <linux/reserve.h>
#include <net/inet_frag.h>
@@ -75,6 +76,8 @@ void inet_frags_init_net(struct netns_fr
nf->nqueues = 0;
atomic_set(&nf->mem, 0);
INIT_LIST_HEAD(&nf->lru_list);
+ mutex_init(&nf->lock);
+ mem_reserve_init(&nf->reserve, "IP fragement cache", NULL);
}
EXPORT_SYMBOL(inet_frags_init_net);
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -45,6 +45,8 @@
#include <linux/inet.h>
#include <linux/netfilter_ipv4.h>
#include <net/inet_ecn.h>
+#include <linux/reserve.h>
+#include <linux/nsproxy.h>
/* NOTE. Logic of IP defragmentation is parallel to corresponding IPv6
* code now. If you change something here, _PLEASE_ update ipv6/reassembly.c
@@ -635,6 +637,34 @@ int ip_defrag(struct sk_buff *skb, u32 u
EXPORT_SYMBOL(ip_defrag);
#ifdef CONFIG_SYSCTL
+static int
+proc_dointvec_fragment(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv4.frags.high_thresh);
+ ctl_table tmp = *table;
+ int new_bytes, ret;
+
+ mutex_lock(&net->ipv4.frags.lock);
+ if (write) {
+ tmp.data = &new_bytes;
+ table = &tmp;
+ }
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+ if (!ret && write) {
+ ret = mem_reserve_kmalloc_set(&net->ipv4.frags.reserve,
+ new_bytes);
+ if (!ret)
+ net->ipv4.frags.high_thresh = new_bytes;
+ }
+ mutex_unlock(&net->ipv4.frags.lock);
+
+ return ret;
+}
+
static int zero;
static struct ctl_table ip4_frags_ns_ctl_table[] = {
@@ -643,7 +673,7 @@ static struct ctl_table ip4_frags_ns_ctl
.data = &init_net.ipv4.frags.high_thresh,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec
+ .proc_handler = proc_dointvec_fragment,
},
{
.procname = "ipfrag_low_thresh",
@@ -741,6 +771,8 @@ static inline void ip4_frags_ctl_registe
static int __net_init ipv4_frags_init_net(struct net *net)
{
+ int ret;
+
/*
* Fragment cache limits. We will commit 256K at one time. Should we
* cross that limit we will prune down to 192K. This should cope with
@@ -758,11 +790,31 @@ static int __net_init ipv4_frags_init_ne
inet_frags_init_net(&net->ipv4.frags);
- return ip4_frags_ns_ctl_register(net);
+ ret = ip4_frags_ns_ctl_register(net);
+ if (ret)
+ goto out_reg;
+
+ mem_reserve_init(&net->ipv4.frags.reserve, "IPv4 fragment cache",
+ &net_skb_reserve);
+ ret = mem_reserve_kmalloc_set(&net->ipv4.frags.reserve,
+ net->ipv4.frags.high_thresh);
+ if (ret)
+ goto out_reserve;
+
+ return 0;
+
+out_reserve:
+ mem_reserve_disconnect(&net->ipv4.frags.reserve);
+ ip4_frags_ns_ctl_unregister(net);
+out_reg:
+ inet_frags_exit_net(&net->ipv4.frags, &ip4_frags);
+
+ return ret;
}
static void __net_exit ipv4_frags_exit_net(struct net *net)
{
+ mem_reserve_disconnect(&net->ipv4.frags.reserve);
ip4_frags_ns_ctl_unregister(net);
inet_frags_exit_net(&net->ipv4.frags, &ip4_frags);
}
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -108,6 +108,7 @@
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
+#include <linux/reserve.h>
#define RT_FL_TOS(oldflp) \
((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK)))
@@ -224,6 +225,7 @@ struct rt_hash_bucket {
# define RT_HASH_LOCK_SZ 256
# endif
#endif
+#include <linux/reserve.h>
static spinlock_t *rt_hash_locks;
# define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)]
@@ -268,6 +270,10 @@ static inline int rt_genid(struct net *n
return atomic_read(&net->ipv4.rt_genid);
}
+static struct mem_reserve ipv4_route_reserve;
+
+static struct mem_reserve ipv4_route_reserve;
+
#ifdef CONFIG_PROC_FS
struct rt_cache_iter_state {
struct seq_net_private p;
@@ -398,6 +404,36 @@ static int rt_cache_seq_show(struct seq_
return 0;
}
+static struct mutex ipv4_route_lock;
+
+static int
+proc_dointvec_route(struct ctl_table *table, int write, void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ ctl_table tmp = *table;
+ int new_size, ret;
+
+ mutex_lock(&ipv4_route_lock);
+ if (write) {
+ tmp.data = &new_size;
+ table = &tmp;
+ }
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+ if (!ret && write) {
+ ret = mem_reserve_kmem_cache_set(&ipv4_route_reserve,
+ ipv4_dst_ops.kmem_cachep, new_size);
+ if (!ret)
+ ip_rt_max_size = new_size;
+ }
+ mutex_unlock(&ipv4_route_lock);
+
+ return ret;
+}
+
+static struct mutex ipv4_route_lock;
+
static const struct seq_operations rt_cache_seq_ops = {
.start = rt_cache_seq_start,
.next = rt_cache_seq_next,
@@ -3103,7 +3139,7 @@ static ctl_table ipv4_route_table[] = {
.data = &ip_rt_max_size,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dointvec_route,
},
{
/* Deprecated. Use gc_min_interval_ms */
@@ -3140,7 +3176,7 @@ static ctl_table ipv4_route_table[] = {
.data = &ip_rt_redirect_load,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dointvec_route,
},
{
.procname = "redirect_number",
@@ -3334,6 +3370,24 @@ int __init ip_rt_init(void)
ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1);
ip_rt_max_size = (rt_hash_mask + 1) * 16;
+#ifdef CONFIG_PROCFS
+ mutex_init(&ipv4_route_lock);
+#endif
+
+ mem_reserve_init(&ipv4_route_reserve, "IPv4 route cache",
+ &net_rx_reserve);
+ mem_reserve_kmem_cache_set(&ipv4_route_reserve,
+ ipv4_dst_ops.kmem_cachep, ip_rt_max_size);
+
+#ifdef CONFIG_PROCFS
+ mutex_init(&ipv4_route_lock);
+#endif
+
+ mem_reserve_init(&ipv4_route_reserve, "IPv4 route cache",
+ &net_rx_reserve);
+ mem_reserve_kmem_cache_set(&ipv4_route_reserve,
+ ipv4_dst_ops.kmem_cachep, ip_rt_max_size);
+
devinet_init();
ip_fib_init();
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -42,6 +42,7 @@
#include <linux/jhash.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
+#include <linux/reserve.h>
#include <net/sock.h>
#include <net/snmp.h>
@@ -639,13 +640,41 @@ static const struct inet6_protocol frag_
};
#ifdef CONFIG_SYSCTL
+static int
+proc_dointvec_fragment(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv6.frags.high_thresh);
+ ctl_table tmp = *table;
+ int new_bytes, ret;
+
+ mutex_lock(&net->ipv6.frags.lock);
+ if (write) {
+ tmp.data = &new_bytes;
+ table = &tmp;
+ }
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+ if (!ret && write) {
+ ret = mem_reserve_kmalloc_set(&net->ipv6.frags.reserve,
+ new_bytes);
+ if (!ret)
+ net->ipv6.frags.high_thresh = new_bytes;
+ }
+ mutex_unlock(&net->ipv6.frags.lock);
+
+ return ret;
+}
+
static struct ctl_table ip6_frags_ns_ctl_table[] = {
{
.procname = "ip6frag_high_thresh",
.data = &init_net.ipv6.frags.high_thresh,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec
+ .proc_handler = proc_dointvec_fragment,
},
{
.procname = "ip6frag_low_thresh",
@@ -750,17 +779,39 @@ static inline void ip6_frags_sysctl_unre
static int __net_init ipv6_frags_init_net(struct net *net)
{
+ int ret;
+
net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
inet_frags_init_net(&net->ipv6.frags);
- return ip6_frags_ns_sysctl_register(net);
+ ret = ip6_frags_ns_sysctl_register(net);
+ if (ret)
+ goto out_reg;
+
+ mem_reserve_init(&net->ipv6.frags.reserve, "IPv6 fragment cache",
+ &net_skb_reserve);
+ ret = mem_reserve_kmalloc_set(&net->ipv6.frags.reserve,
+ net->ipv6.frags.high_thresh);
+ if (ret)
+ goto out_reserve;
+
+ return 0;
+
+out_reserve:
+ mem_reserve_disconnect(&net->ipv6.frags.reserve);
+ ip6_frags_ns_sysctl_unregister(net);
+out_reg:
+ inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
+
+ return ret;
}
static void __net_exit ipv6_frags_exit_net(struct net *net)
{
+ mem_reserve_disconnect(&net->ipv6.frags.reserve);
ip6_frags_ns_sysctl_unregister(net);
inet_frags_exit_net(&net->ipv6.frags, &ip6_frags);
}
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -37,6 +37,7 @@
#include <linux/mroute6.h>
#include <linux/init.h>
#include <linux/if_arp.h>
+#include <linux/reserve.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/nsproxy.h>
@@ -2532,6 +2533,34 @@ int ipv6_sysctl_rtcache_flush(ctl_table
return 0;
}
+static int
+proc_dointvec_route(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv6.sysctl.ip6_rt_max_size);
+ ctl_table tmp = *table;
+ int new_size, ret;
+
+ mutex_lock(&net->ipv6.sysctl.ip6_rt_lock);
+ if (write) {
+ tmp.data = &new_size;
+ table = &tmp;
+ }
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+ if (!ret && write) {
+ ret = mem_reserve_kmem_cache_set(&net->ipv6.ip6_rt_reserve,
+ net->ipv6.ip6_dst_ops.kmem_cachep, new_size);
+ if (!ret)
+ net->ipv6.sysctl.ip6_rt_max_size = new_size;
+ }
+ mutex_unlock(&net->ipv6.sysctl.ip6_rt_lock);
+
+ return ret;
+}
+
ctl_table ipv6_route_table_template[] = {
{
.procname = "flush",
@@ -2552,7 +2581,7 @@ ctl_table ipv6_route_table_template[] =
.data = &init_net.ipv6.sysctl.ip6_rt_max_size,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dointvec_route,
},
{
.procname = "gc_min_interval",
@@ -2627,6 +2656,8 @@ struct ctl_table * __net_init ipv6_route
table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
}
+ mutex_init(&net->ipv6.sysctl.ip6_rt_lock);
+
return table;
}
#endif
@@ -2676,6 +2707,14 @@ static int __net_init ip6_route_net_init
net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
+ mem_reserve_init(&net->ipv6.ip6_rt_reserve, "IPv6 route cache",
+ &net_rx_reserve);
+ ret = mem_reserve_kmem_cache_set(&net->ipv6.ip6_rt_reserve,
+ net->ipv6.ip6_dst_ops.kmem_cachep,
+ net->ipv6.sysctl.ip6_rt_max_size);
+ if (ret)
+ goto out_reserve_fail;
+
#ifdef CONFIG_PROC_FS
proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
@@ -2686,12 +2725,15 @@ static int __net_init ip6_route_net_init
out:
return ret;
+out_reserve_fail:
+ mem_reserve_disconnect(&net->ipv6.ip6_rt_reserve);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ kfree(net->ipv6.ip6_blk_hole_entry);
out_ip6_prohibit_entry:
kfree(net->ipv6.ip6_prohibit_entry);
out_ip6_null_entry:
- kfree(net->ipv6.ip6_null_entry);
#endif
+ kfree(net->ipv6.ip6_null_entry);
out_ip6_dst_entries:
dst_entries_destroy(&net->ipv6.ip6_dst_ops);
out_ip6_dst_ops:
@@ -2702,6 +2744,7 @@ static void __net_exit ip6_route_net_exi
proc_net_remove(net, "ipv6_route");
proc_net_remove(net, "rt6_stats");
#endif
+ mem_reserve_disconnect(&net->ipv6.ip6_rt_reserve);
kfree(net->ipv6.ip6_null_entry);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
kfree(net->ipv6.ip6_prohibit_entry);
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