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ipv6: introduce idgen_delay and idgen_retries knobs 

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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2
include/net/netns/ipv6.h
View File

@ -32,6 +32,8 @@ struct netns_sysctl_ipv6 {
int icmpv6_time;
int anycast_src_echo_reply;
int fwmark_reflect;
int idgen_retries;
int idgen_delay;
};
struct netns_ipv6 {

11
net/ipv6/addrconf.c
View File

@ -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 @@ static int ipv6_generate_stable_address(struct in6_addr *address,
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;
}

2
net/ipv6/af_inet6.c
View File

@ -766,6 +766,8 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.icmpv6_time = 1*HZ;
net->ipv6.sysctl.flowlabel_consistency = 1;
net->ipv6.sysctl.auto_flowlabels = 0;
net->ipv6.sysctl.idgen_retries = 3;
net->ipv6.sysctl.idgen_delay = 1 * HZ;
atomic_set(&net->ipv6.fib6_sernum, 1);
err = ipv6_init_mibs(net);

16
net/ipv6/sysctl_net_ipv6.c
View File

@ -54,6 +54,20 @@ static struct ctl_table ipv6_table_template[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "idgen_retries",
.data = &init_net.ipv6.sysctl.idgen_retries,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "idgen_delay",
.data = &init_net.ipv6.sysctl.idgen_delay,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{ }
};
@ -93,6 +107,8 @@ static int __net_init ipv6_sysctl_net_init(struct net *net)
ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
ipv6_table[4].data = &net->ipv6.sysctl.fwmark_reflect;
ipv6_table[5].data = &net->ipv6.sysctl.idgen_retries;
ipv6_table[6].data = &net->ipv6.sysctl.idgen_delay;
ipv6_route_table = ipv6_route_sysctl_init(net);
if (!ipv6_route_table)