iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ipv6: Add a sysctl to control multipath hash fields

Browse Source 
A subsequent patch will add a new multipath hash policy where the packet
fields used for multipath hash calculation are determined by user space.
This patch adds a sysctl that allows user space to set these fields.

The packet fields are represented using a bitmask and are common between
IPv4 and IPv6 to allow user space to use the same numbering across both
protocols. For example, to hash based on standard 5-tuple:

 # sysctl -w net.ipv6.fib_multipath_hash_fields=0x0037
 net.ipv6.fib_multipath_hash_fields = 0x0037

To avoid introducing holes in 'struct netns_sysctl_ipv6', move the
'bindv6only' field after the multipath hash fields.

The kernel rejects unknown fields, for example:

 # sysctl -w net.ipv6.fib_multipath_hash_fields=0x1000
 sysctl: setting key "net.ipv6.fib_multipath_hash_fields": Invalid argument

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel
2021-05-17 21:15:22 +03:00
committed by David S. Miller
parent b95b6e072a
commit ed13923f98
5 changed files with 54 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/net/ipv6.h
View File

@ -926,11 +926,19 @@ static inline int ip6_multipath_hash_policy(const struct net *net)
{
return net->ipv6.sysctl.multipath_hash_policy;
}
static inline u32 ip6_multipath_hash_fields(const struct net *net)
{
return net->ipv6.sysctl.multipath_hash_fields;
}
#else
static inline int ip6_multipath_hash_policy(const struct net *net)
{
return 0;
}
static inline u32 ip6_multipath_hash_fields(const struct net *net)
{
return 0;
}
#endif
/*