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authorIdo Schimmel <idosch@OSS.NVIDIA.COM>2021-05-17 21:15:18 +0300
committerDavid S. Miller <davem@davemloft.net>2021-05-18 23:27:32 +0300
commitce5c9c20d364f156c885efed8c71fca2945db00f (patch)
treebb4858afb789ab04d7330dc3bff07f999814bbff /net/ipv4/sysctl_net_ipv4.c
parent2e68ea92684181412b73979baf1af7d04619c52c (diff)
downloadlinux-ce5c9c20d364f156c885efed8c71fca2945db00f.tar.xz
ipv4: 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.ipv4.fib_multipath_hash_fields=0x0037 net.ipv4.fib_multipath_hash_fields = 0x0037 The kernel rejects unknown fields, for example: # sysctl -w net.ipv4.fib_multipath_hash_fields=0x1000 sysctl: setting key "net.ipv4.fib_multipath_hash_fields": Invalid argument More fields can be added in the future, if needed. 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/ipv4/sysctl_net_ipv4.c')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index a62934b9f15a..45bab3733621 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -19,6 +19,7 @@
#include <net/snmp.h>
#include <net/icmp.h>
#include <net/ip.h>
+#include <net/ip_fib.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/udp.h>
@@ -48,6 +49,8 @@ static int ip_ping_group_range_min[] = { 0, 0 };
static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
static u32 u32_max_div_HZ = UINT_MAX / HZ;
static int one_day_secs = 24 * 3600;
+static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
+ FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
/* obsolete */
static int sysctl_tcp_low_latency __read_mostly;
@@ -1052,6 +1055,15 @@ static struct ctl_table ipv4_net_table[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = &two,
},
+ {
+ .procname = "fib_multipath_hash_fields",
+ .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
+ .maxlen = sizeof(u32),
+ .mode = 0644,
+ .proc_handler = proc_douintvec_minmax,
+ .extra1 = SYSCTL_ONE,
+ .extra2 = &fib_multipath_hash_fields_all_mask,
+ },
#endif
{
.procname = "ip_unprivileged_port_start",