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flowi: Abstract out functions to get flow hash based on flowi 

Create __get_hash_from_flowi6 and __get_hash_from_flowi4 to get the
flow keys and hash based on flowi structures. These are called by
__skb_get_hash_flowi6 and __skb_get_hash_flowi4. Also, created
get_hash_from_flowi6 and get_hash_from_flowi4 which can be called
when just the hash value for a flowi is needed.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-09-01 09:24:25 -07:00 committed by David S. Miller
parent bcc83839ff
commit c6cc1ca7f4
4 changed files with 69 additions and 4 deletions
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16
include/linux/skbuff.h
View File

@ -1030,8 +1030,12 @@ __u32 __skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6);
static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6)
{
if (!skb->l4_hash && !skb->sw_hash)
__skb_get_hash_flowi6(skb, fl6);
if (!skb->l4_hash && !skb->sw_hash) {
struct flow_keys keys;
__skb_set_sw_hash(skb, __get_hash_from_flowi6(fl6, &keys),
flow_keys_have_l4(&keys));
}
return skb->hash;
}
@ -1040,8 +1044,12 @@ __u32 __skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl);
static inline __u32 skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl4)
{
if (!skb->l4_hash && !skb->sw_hash)
__skb_get_hash_flowi4(skb, fl4);
if (!skb->l4_hash && !skb->sw_hash) {
struct flow_keys keys;
__skb_set_sw_hash(skb, __get_hash_from_flowi4(fl4, &keys),
flow_keys_have_l4(&keys));
}
return skb->hash;
}

19
include/net/flow.h
View File

@ -10,6 +10,7 @@
#include <linux/socket.h>
#include <linux/in6.h>
#include <linux/atomic.h>
#include <net/flow_dissector.h>
/*
* ifindex generation is per-net namespace, and loopback is
@ -243,4 +244,22 @@ void flow_cache_flush(struct net *net);
void flow_cache_flush_deferred(struct net *net);
extern atomic_t flow_cache_genid;
__u32 __get_hash_from_flowi6(struct flowi6 *fl6, struct flow_keys *keys);
static inline __u32 get_hash_from_flowi6(struct flowi6 *fl6)
{
struct flow_keys keys;
return __get_hash_from_flowi6(fl6, &keys);
}
__u32 __get_hash_from_flowi4(struct flowi4 *fl4, struct flow_keys *keys);
static inline __u32 get_hash_from_flowi4(struct flowi4 *fl4)
{
struct flow_keys keys;
return __get_hash_from_flowi4(fl4, &keys);
}
#endif

2
include/net/flow_dissector.h
View File

@ -172,4 +172,6 @@ static inline bool flow_keys_have_l4(struct flow_keys *keys)
return (keys->ports.ports || keys->tags.flow_label);
}
u32 flow_hash_from_keys(struct flow_keys *keys);
#endif

36
net/core/flow.c
View File

@ -22,6 +22,7 @@
#include <linux/cpumask.h>
#include <linux/mutex.h>
#include <net/flow.h>
#include <net/flow_dissector.h>
#include <linux/atomic.h>
#include <linux/security.h>
#include <net/net_namespace.h>
@ -509,3 +510,38 @@ void flow_cache_fini(struct net *net)
fc->percpu = NULL;
}
EXPORT_SYMBOL(flow_cache_fini);
__u32 __get_hash_from_flowi6(struct flowi6 *fl6, struct flow_keys *keys)
{
memset(keys, 0, sizeof(*keys));
memcpy(&keys->addrs.v6addrs.src, &fl6->saddr,
sizeof(keys->addrs.v6addrs.src));
memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr,
sizeof(keys->addrs.v6addrs.dst));
keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
keys->ports.src = fl6->fl6_sport;
keys->ports.dst = fl6->fl6_dport;
keys->keyid.keyid = fl6->fl6_gre_key;
keys->tags.flow_label = (__force u32)fl6->flowlabel;
keys->basic.ip_proto = fl6->flowi6_proto;
return flow_hash_from_keys(keys);
}
EXPORT_SYMBOL(__get_hash_from_flowi6);
__u32 __get_hash_from_flowi4(struct flowi4 *fl4, struct flow_keys *keys)
{
memset(keys, 0, sizeof(*keys));
keys->addrs.v4addrs.src = fl4->saddr;
keys->addrs.v4addrs.dst = fl4->daddr;
keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
keys->ports.src = fl4->fl4_sport;
keys->ports.dst = fl4->fl4_dport;
keys->keyid.keyid = fl4->fl4_gre_key;
keys->basic.ip_proto = fl4->flowi4_proto;
return flow_hash_from_keys(keys);
}
EXPORT_SYMBOL(__get_hash_from_flowi4);