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| author | Alex Henrie <alexhenrie24@gmail.com> | 2024-02-13 23:26:31 -0700 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-02-15 15:34:40 +0100 |
| commit | a5fcea2d2f790aa90b6e996d411ae2cf8db55186 (patch) | |
| tree | 8d0eaa45f00bfbffc6b6f8e9dd2c08b5521aca1c /net/ipv6 | |
| parent | 2aa8f155b09519814e449dc19adacf01fd1367ee (diff) | |
| download | linux-a5fcea2d2f790aa90b6e996d411ae2cf8db55186.tar.gz | |
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')
| -rw-r--r-- | net/ipv6/addrconf.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 65e886d7d80cc..283823fba96a8 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), |