Fri, May 22, 2015 at 02:11:42AM CEST, t...@herbertland.com wrote:
>We don't need to return the IPv6 address hash as part of flow keys.
>In general, using the IPv6 address hash is risky in a hash value
>since the underlying use of xor provides no entropy. If someone
>really needs the hash value they can get it from the full IPv6
>addresses in flow keys (e.g. from flow_get_u32_src).
>
>Signed-off-by: Tom Herbert <t...@herbertland.com>
>---
> include/net/flow_dissector.h | 1 -
> net/core/flow_dissector.c | 17 -----------------
> 2 files changed, 18 deletions(-)
>
>diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
>index 3ee606a..59f00f9 100644
>--- a/include/net/flow_dissector.h
>+++ b/include/net/flow_dissector.h
>@@ -103,7 +103,6 @@ enum flow_dissector_key_id {
> FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
> FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs
> */
> FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs
> */
>- FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs
>*/
> FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
> FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
> FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs
> */
>diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
>index 8d6f089..44e47c5 100644
>--- a/net/core/flow_dissector.c
>+++ b/net/core/flow_dissector.c
>@@ -200,19 +200,6 @@ ipv6:
> nhoff += sizeof(struct ipv6hdr);
>
> if (skb_flow_dissector_uses_key(flow_dissector,
>-
>FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS)) {
>- key_addrs = skb_flow_dissector_target(flow_dissector,
>-
>FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS,
>- target_container);
>-
>- key_addrs->v4addrs.src =
>- (__force __be32)ipv6_addr_hash(&iph->saddr);
>- key_addrs->v4addrs.dst =
>- (__force __be32)ipv6_addr_hash(&iph->daddr);
>- key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
>- goto flow_label;
>- }
>- if (skb_flow_dissector_uses_key(flow_dissector,
> FLOW_DISSECTOR_KEY_IPV6_ADDRS))
> {
> struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs;
>
You can change the code flow now to pre-b924933cbbfbdcaa2831a39 state:
if (!skb_flow_dissector_uses_key(flow_dissector,
FLOW_DISSECTOR_KEY_IPV6_ADDRS))
break;
....
flow_label = .....
killing flow_label label.
Other than that,
Acked-by: Jiri Pirko <j...@resnulli.us>
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