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authorDaniel Borkmann <dborkman@redhat.com>2013-04-09 03:47:16 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-09 13:12:23 -0400
commit617fe29d45bdfffba2739e6512c83e766e6ae72c (patch)
tree8eb3d331f1c042893a990af3ee48e2aab4061fef /net
parentfc403832f7bd94014fe3d965e0652a857160f1c9 (diff)
net: ipv6: only invalidate previously tokenized addresses
Instead of invalidating all IPv6 addresses with global scope when one decides to use IPv6 tokens, we should only invalidate previous tokens and leave the rest intact until they expire eventually (or are intact forever). For doing this less greedy approach, we're adding a bool at the end of inet6_ifaddr structure instead, for two reasons: i) per-inet6_ifaddr flag space is already used up, making it wider might not be a good idea, since ii) also we do not necessarily need to export this information into user space. Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 713ebe303f6..28b61e89bbb 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -878,6 +878,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
ifa->prefix_len = pfxlen;
ifa->flags = flags | IFA_F_TENTATIVE;
ifa->cstamp = ifa->tstamp = jiffies;
+ ifa->tokenized = false;
ifa->rt = rt;
@@ -2134,6 +2135,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
struct inet6_ifaddr *ifp;
struct in6_addr addr;
int create = 0, update_lft = 0;
+ bool tokenized = false;
if (pinfo->prefix_len == 64) {
memcpy(&addr, &pinfo->prefix, 8);
@@ -2143,6 +2145,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
memcpy(addr.s6_addr + 8,
in6_dev->token.s6_addr + 8, 8);
read_unlock_bh(&in6_dev->lock);
+ tokenized = true;
} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
in6_dev_put(in6_dev);
@@ -2185,6 +2188,7 @@ ok:
update_lft = create = 1;
ifp->cstamp = jiffies;
+ ifp->tokenized = tokenized;
addrconf_dad_start(ifp);
}
@@ -4339,8 +4343,7 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
/* Well, that's kinda nasty ... */
list_for_each_entry(ifp, &idev->addr_list, if_list) {
spin_lock(&ifp->lock);
- if (ipv6_addr_src_scope(&ifp->addr) ==
- IPV6_ADDR_SCOPE_GLOBAL) {
+ if (ifp->tokenized) {
ifp->valid_lft = 0;
ifp->prefered_lft = 0;
}