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[NETNS][IPV6] route6 - dynamically allocate ip6_dst_ops

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ip6_dst_ops is dynamically allocated in init and exit functions.  That
provides the ability to do multiple instanciations of this structure.

This will be needed for network namespaces, indeed dst_ops stores data
that are required to be per namespace: entries and gc_thresh.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Lezcano 2008-03-04 13:48:53 -08:00 committed by David S. Miller
parent 8ed6778967
commit 9a7ec3a94d
1 changed files with 30 additions and 19 deletions
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49
net/ipv6/route.c
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@ -97,7 +97,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
struct in6_addr *gwaddr, int ifindex); struct in6_addr *gwaddr, int ifindex);
#endif #endif
static struct dst_ops ip6_dst_ops = { static struct dst_ops ip6_dst_ops_template = {
.family = AF_INET6, .family = AF_INET6,
.protocol = __constant_htons(ETH_P_IPV6), .protocol = __constant_htons(ETH_P_IPV6),
.gc = ip6_dst_gc, .gc = ip6_dst_gc,
@ -113,6 +113,8 @@ static struct dst_ops ip6_dst_ops = {
.entries = ATOMIC_INIT(0), .entries = ATOMIC_INIT(0),
}; };
static struct dst_ops *ip6_dst_ops;
static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
{ {
} }
@ -137,7 +139,6 @@ static struct rt6_info ip6_null_entry_template = {
.metrics = { [RTAX_HOPLIMIT - 1] = 255, }, .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
.input = ip6_pkt_discard, .input = ip6_pkt_discard,
.output = ip6_pkt_discard_out, .output = ip6_pkt_discard_out,
.ops = &ip6_dst_ops,
} }
}, },
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
@ -160,7 +161,6 @@ struct rt6_info ip6_prohibit_entry_template = {
.metrics = { [RTAX_HOPLIMIT - 1] = 255, }, .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
.input = ip6_pkt_prohibit, .input = ip6_pkt_prohibit,
.output = ip6_pkt_prohibit_out, .output = ip6_pkt_prohibit_out,
.ops = &ip6_dst_ops,
} }
}, },
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
@ -178,7 +178,6 @@ static struct rt6_info ip6_blk_hole_entry_template = {
.metrics = { [RTAX_HOPLIMIT - 1] = 255, }, .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
.input = dst_discard, .input = dst_discard,
.output = dst_discard, .output = dst_discard,
.ops = &ip6_dst_ops,
} }
}, },
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
@ -191,7 +190,7 @@ static struct rt6_info ip6_blk_hole_entry_template = {
/* allocate dst with ip6_dst_ops */ /* allocate dst with ip6_dst_ops */
static __inline__ struct rt6_info *ip6_dst_alloc(void) static __inline__ struct rt6_info *ip6_dst_alloc(void)
{ {
return (struct rt6_info *)dst_alloc(&ip6_dst_ops); return (struct rt6_info *)dst_alloc(ip6_dst_ops);
} }
static void ip6_dst_destroy(struct dst_entry *dst) static void ip6_dst_destroy(struct dst_entry *dst)
@ -1000,18 +999,18 @@ static int ip6_dst_gc(struct dst_ops *ops)
unsigned long now = jiffies; unsigned long now = jiffies;
if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) && if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) &&
atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size) atomic_read(&ip6_dst_ops->entries) <= init_net.ipv6.sysctl.ip6_rt_max_size)
goto out; goto out;
expire++; expire++;
fib6_run_gc(expire, &init_net); fib6_run_gc(expire, &init_net);
last_gc = now; last_gc = now;
if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) if (atomic_read(&ip6_dst_ops->entries) < ip6_dst_ops->gc_thresh)
expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1; expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1;
out: out:
expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity; expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity;
return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size); return (atomic_read(&ip6_dst_ops->entries) > init_net.ipv6.sysctl.ip6_rt_max_size);
} }
/* Clean host part of a prefix. Not necessary in radix tree, /* Clean host part of a prefix. Not necessary in radix tree,
@ -2408,7 +2407,7 @@ static int rt6_stats_seq_show(struct seq_file *seq, void *v)
net->ipv6.rt6_stats->fib_rt_alloc, net->ipv6.rt6_stats->fib_rt_alloc,
net->ipv6.rt6_stats->fib_rt_entries, net->ipv6.rt6_stats->fib_rt_entries,
net->ipv6.rt6_stats->fib_rt_cache, net->ipv6.rt6_stats->fib_rt_cache,
atomic_read(&ip6_dst_ops.entries), atomic_read(&ip6_dst_ops->entries),
net->ipv6.rt6_stats->fib_discarded_routes); net->ipv6.rt6_stats->fib_discarded_routes);
return 0; return 0;
@ -2464,7 +2463,7 @@ ctl_table ipv6_route_table_template[] = {
{ {
.ctl_name = NET_IPV6_ROUTE_GC_THRESH, .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
.procname = "gc_thresh", .procname = "gc_thresh",
.data = &ip6_dst_ops.gc_thresh, .data = &ip6_dst_ops_template.gc_thresh,
.maxlen = sizeof(int), .maxlen = sizeof(int),
.mode = 0644, .mode = 0644,
.proc_handler = &proc_dointvec, .proc_handler = &proc_dointvec,
@ -2553,8 +2552,7 @@ struct ctl_table *ipv6_route_sysctl_init(struct net *net)
if (table) { if (table) {
table[0].data = &net->ipv6.sysctl.flush_delay; table[0].data = &net->ipv6.sysctl.flush_delay;
/* table[1].data will be handled when we have table[1].data = &ip6_dst_ops_template.gc_thresh;
routes per namespace */
table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
@ -2580,6 +2578,7 @@ static int ip6_route_net_init(struct net *net)
goto out; goto out;
net->ipv6.ip6_null_entry->u.dst.path = net->ipv6.ip6_null_entry->u.dst.path =
(struct dst_entry *)net->ipv6.ip6_null_entry; (struct dst_entry *)net->ipv6.ip6_null_entry;
net->ipv6.ip6_null_entry->u.dst.ops = ip6_dst_ops;
#ifdef CONFIG_IPV6_MULTIPLE_TABLES #ifdef CONFIG_IPV6_MULTIPLE_TABLES
net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
@ -2591,6 +2590,7 @@ static int ip6_route_net_init(struct net *net)
} }
net->ipv6.ip6_prohibit_entry->u.dst.path = net->ipv6.ip6_prohibit_entry->u.dst.path =
(struct dst_entry *)net->ipv6.ip6_prohibit_entry; (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
net->ipv6.ip6_prohibit_entry->u.dst.ops = ip6_dst_ops;
net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
sizeof(*net->ipv6.ip6_blk_hole_entry), sizeof(*net->ipv6.ip6_blk_hole_entry),
@ -2602,6 +2602,7 @@ static int ip6_route_net_init(struct net *net)
} }
net->ipv6.ip6_blk_hole_entry->u.dst.path = net->ipv6.ip6_blk_hole_entry->u.dst.path =
(struct dst_entry *)net->ipv6.ip6_blk_hole_entry; (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
net->ipv6.ip6_blk_hole_entry->u.dst.ops = ip6_dst_ops;
#endif #endif
#ifdef CONFIG_PROC_FS #ifdef CONFIG_PROC_FS
@ -2640,13 +2641,20 @@ int __init ip6_route_init(void)
{ {
int ret; int ret;
ip6_dst_ops.kmem_cachep = ip6_dst_ops = kmemdup(&ip6_dst_ops_template,
kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, sizeof(*ip6_dst_ops), GFP_KERNEL);
SLAB_HWCACHE_ALIGN, NULL); if (!ip6_dst_ops)
if (!ip6_dst_ops.kmem_cachep)
return -ENOMEM; return -ENOMEM;
ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; ret = -ENOMEM;
ip6_dst_ops_template.kmem_cachep =
kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!ip6_dst_ops_template.kmem_cachep)
goto out_ip6_dst_ops;
ip6_dst_ops->kmem_cachep = ip6_dst_ops_template.kmem_cachep;
ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
ret = register_pernet_subsys(&ip6_route_net_ops); ret = register_pernet_subsys(&ip6_route_net_ops);
if (ret) if (ret)
@ -2697,7 +2705,9 @@ out_fib6_init:
out_register_subsys: out_register_subsys:
unregister_pernet_subsys(&ip6_route_net_ops); unregister_pernet_subsys(&ip6_route_net_ops);
out_kmem_cache: out_kmem_cache:
kmem_cache_destroy(ip6_dst_ops.kmem_cachep); kmem_cache_destroy(ip6_dst_ops->kmem_cachep);
out_ip6_dst_ops:
kfree(ip6_dst_ops);
goto out; goto out;
} }
@ -2708,5 +2718,6 @@ void ip6_route_cleanup(void)
xfrm6_fini(); xfrm6_fini();
fib6_gc_cleanup(); fib6_gc_cleanup();
unregister_pernet_subsys(&ip6_route_net_ops); unregister_pernet_subsys(&ip6_route_net_ops);
kmem_cache_destroy(ip6_dst_ops.kmem_cachep); kmem_cache_destroy(ip6_dst_ops->kmem_cachep);
kfree(ip6_dst_ops);
} }