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Revert "ipv6: remove max_size check inline with ipv4"

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This reverts commit b8a5308fee which is
commit af6d10345c upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I7e768b45f1b301807a89234d2af0fd025a13396e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2024-01-16 16:53:36 +00:00
committed by Treehugger Robot
parent a51283fc69
commit 2c882816b1
3 changed files with 15 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/dst_ops.h
View File

@@ -16,7 +16,7 @@ struct dst_ops {
unsigned short family;
unsigned int gc_thresh;
void (*gc)(struct dst_ops *ops);
int (*gc)(struct dst_ops *ops);
struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
unsigned int (*default_advmss)(const struct dst_entry *);
unsigned int (*mtu)(const struct dst_entry *);

8
net/core/dst.c
View File

@@ -82,8 +82,12 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
if (ops->gc &&
!(flags & DST_NOCOUNT) &&
dst_entries_get_fast(ops) > ops->gc_thresh)
ops->gc(ops);
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);
if (!dst)

13
net/ipv6/route.c
View File

@@ -91,7 +91,7 @@ static struct dst_entry *ip6_negative_advice(struct dst_entry *);
static void ip6_dst_destroy(struct dst_entry *);
static void ip6_dst_ifdown(struct dst_entry *,
struct net_device *dev, int how);
static void ip6_dst_gc(struct dst_ops *ops);
static int ip6_dst_gc(struct dst_ops *ops);
static int ip6_pkt_discard(struct sk_buff *skb);
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
@@ -3295,10 +3295,11 @@ out:
return dst;
}
static void ip6_dst_gc(struct dst_ops *ops)
static int ip6_dst_gc(struct dst_ops *ops)
{
struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
@@ -3306,10 +3307,11 @@ static void ip6_dst_gc(struct dst_ops *ops)
int entries;
entries = dst_entries_get_fast(ops);
if (entries > ops->gc_thresh)
if (entries > rt_max_size)
entries = dst_entries_get_slow(ops);
if (time_after(rt_last_gc + rt_min_interval, jiffies))
if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
entries <= rt_max_size)
goto out;
fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true);
@@ -3319,6 +3321,7 @@ static void ip6_dst_gc(struct dst_ops *ops)
out:
val = atomic_read(&net->ipv6.ip6_rt_gc_expire);
atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity));
return entries > rt_max_size;
}
static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
@@ -6502,7 +6505,7 @@ static int __net_init ip6_route_net_init(struct net *net)
#endif
net->ipv6.sysctl.flush_delay = 0;
net->ipv6.sysctl.ip6_rt_max_size = INT_MAX;
net->ipv6.sysctl.ip6_rt_max_size = 4096;
net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;