summaryrefslogtreecommitdiff
path: root/net/ipv6/addrconf.c
diff options
context:
space:
mode:
authorAlex Henrie <alexhenrie24@gmail.com>2024-02-14 09:26:31 +0300
committerPaolo Abeni <pabeni@redhat.com>2024-02-15 17:34:40 +0300
commita5fcea2d2f790aa90b6e996d411ae2cf8db55186 (patch)
tree8d0eaa45f00bfbffc6b6f8e9dd2c08b5521aca1c /net/ipv6/addrconf.c
parent2aa8f155b09519814e449dc19adacf01fd1367ee (diff)
downloadlinux-a5fcea2d2f790aa90b6e996d411ae2cf8db55186.tar.xz
net: ipv6/addrconf: introduce a regen_min_advance sysctl
In RFC 8981, REGEN_ADVANCE cannot be less than 2 seconds, and the RFC does not permit the creation of temporary addresses with lifetimes shorter than that: > When processing a Router Advertisement with a > Prefix Information option carrying a prefix for the purposes of > address autoconfiguration (i.e., the A bit is set), the host MUST > perform the following steps: > 5. A temporary address is created only if this calculated preferred > lifetime is greater than REGEN_ADVANCE time units. However, some users want to change their IPv6 address as frequently as possible regardless of the RFC's arbitrary minimum lifetime. For the benefit of those users, add a regen_min_advance sysctl parameter that can be set to below or above 2 seconds. Link: https://datatracker.ietf.org/doc/html/rfc8981 Signed-off-by: Alex Henrie <alexhenrie24@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv6/addrconf.c')
-rw-r--r--net/ipv6/addrconf.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 65e886d7d80c..283823fba96a 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -195,6 +195,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = {
.use_tempaddr = 0,
.temp_valid_lft = TEMP_VALID_LIFETIME,
.temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
+ .regen_min_advance = REGEN_MIN_ADVANCE,
.regen_max_retry = REGEN_MAX_RETRY,
.max_desync_factor = MAX_DESYNC_FACTOR,
.max_addresses = IPV6_MAX_ADDRESSES,
@@ -257,6 +258,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
.use_tempaddr = 0,
.temp_valid_lft = TEMP_VALID_LIFETIME,
.temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
+ .regen_min_advance = REGEN_MIN_ADVANCE,
.regen_max_retry = REGEN_MAX_RETRY,
.max_desync_factor = MAX_DESYNC_FACTOR,
.max_addresses = IPV6_MAX_ADDRESSES,
@@ -1341,7 +1343,7 @@ out:
static unsigned long ipv6_get_regen_advance(struct inet6_dev *idev)
{
- return 2 + idev->cnf.regen_max_retry *
+ return idev->cnf.regen_min_advance + idev->cnf.regen_max_retry *
idev->cnf.dad_transmits *
max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
}
@@ -6820,6 +6822,13 @@ static const struct ctl_table addrconf_sysctl[] = {
.proc_handler = proc_dointvec,
},
{
+ .procname = "regen_min_advance",
+ .data = &ipv6_devconf.regen_min_advance,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
.procname = "regen_max_retry",
.data = &ipv6_devconf.regen_max_retry,
.maxlen = sizeof(int),