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geneve: allow to clear ttl inherit

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As Michal remaind, we should allow to clear ttl inherit. Then we will
have three states:

1. set the flag, and do ttl inherit.
2. do not set the flag, use configured ttl value, or default ttl (0) if
   not set.
3. disable ttl inherit, use previous configured ttl value, or default ttl (0).

Fixes: 52d0d404d39dd ("geneve: add ttl inherit support")
CC: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangbin Liu 2018-09-29 23:06:29 +08:00 committed by David S. Miller
parent 5a781ccbd1
commit a97d97bac4
1 changed files with 8 additions and 4 deletions
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12
drivers/net/geneve.c
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@ -1325,11 +1325,15 @@ static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
info->key.tun_id = tunid;
}
if (data[IFLA_GENEVE_TTL])
if (data[IFLA_GENEVE_TTL_INHERIT]) {
if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
*ttl_inherit = true;
else
*ttl_inherit = false;
} else if (data[IFLA_GENEVE_TTL]) {
info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
if (data[IFLA_GENEVE_TTL_INHERIT])
*ttl_inherit = true;
*ttl_inherit = false;
}
if (data[IFLA_GENEVE_TOS])
info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);