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ipv6: introduce idgen_delay and idgen_retries knobs

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This is specified by RFC 7217.

Cc: Erik Kline <ek@google.com>
Cc: Fernando Gont <fgont@si6networks.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: YOSHIFUJI Hideaki/吉藤英明 <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa
2015-03-23 23:36:05 +01:00
committed by David S. Miller
parent 5f40ef77ad
commit 1855b7c3e8
4 changed files with 24 additions and 7 deletions
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11
net/ipv6/addrconf.c
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@@ -1712,6 +1712,7 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
struct in6_addr addr;
struct inet6_dev *idev = ifp->idev;
struct net *net = dev_net(ifp->idev->dev);
if (addrconf_dad_end(ifp)) {
in6_ifa_put(ifp);
@@ -1730,11 +1731,9 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
struct inet6_ifaddr *ifp2;
u32 valid_lft, preferred_lft;
int pfxlen = ifp->prefix_len;
const unsigned int idgen_retries = 3;
const unsigned int idgen_delay = 1 * HZ;
int retries = ifp->stable_privacy_retry + 1;
if (retries > idgen_retries) {
if (retries > net->ipv6.sysctl.idgen_retries) {
net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
ifp->idev->dev->name);
goto errdad;
@@ -1769,7 +1768,7 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
ifp2->state = INET6_IFADDR_STATE_PREDAD;
spin_unlock_bh(&ifp2->lock);
addrconf_mod_dad_work(ifp2, idgen_delay);
addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
in6_ifa_put(ifp2);
lock_errdad:
spin_lock_bh(&ifp->lock);
@@ -2899,8 +2898,6 @@ static int ipv6_generate_stable_address(struct in6_addr *address,
u8 dad_count,
const struct inet6_dev *idev)
{
static const int idgen_retries = 3;
static DEFINE_SPINLOCK(lock);
static __u32 digest[SHA_DIGEST_WORDS];
static __u32 workspace[SHA_WORKSPACE_WORDS];
@@ -2950,7 +2947,7 @@ retry:
if (ipv6_reserved_interfaceid(temp)) {
dad_count++;
if (dad_count > idgen_retries)
if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
return -1;
goto retry;
}