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| author | Ido Schimmel <idosch@OSS.NVIDIA.COM> | 2021-05-17 20:15:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-05-18 22:27:32 +0200 |
| commit | ed13923f980ef84dde0b9010b9e09052dc31a909 (patch) | |
| tree | c93208287485abcfd73fdb30abb374b70cb5f239 /net/ipv6/ip6_fib.c | |
| parent | ipv6: Calculate multipath hash inside switch statement (diff) | |
| download | linux-ed13923f980ef84dde0b9010b9e09052dc31a909.tar.xz linux-ed13923f980ef84dde0b9010b9e09052dc31a909.zip | |
ipv6: Add a sysctl to control multipath hash fields
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>
Diffstat (limited to 'net/ipv6/ip6_fib.c')
| -rw-r--r-- | net/ipv6/ip6_fib.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 33d2d6a4e28c..2d650dc24349 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -32,6 +32,7 @@ #include <net/lwtunnel.h> #include <net/fib_notifier.h> +#include <net/ip_fib.h> #include <net/ip6_fib.h> #include <net/ip6_route.h> @@ -2355,6 +2356,10 @@ static int __net_init fib6_net_init(struct net *net) if (err) return err; + /* Default to 3-tuple */ + net->ipv6.sysctl.multipath_hash_fields = + FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK; + spin_lock_init(&net->ipv6.fib6_gc_lock); rwlock_init(&net->ipv6.fib6_walker_lock); INIT_LIST_HEAD(&net->ipv6.fib6_walkers); |