This patch moves the functionality to add a RA PIO prefix generated
address in an own function. This move prepares to add a hook for
adding a second address for a second link-layer address. E.g. short
address for 802.15.4 6LoWPAN.
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Hideaki YOSHIFUJI <yoshfuji@xxxxxxxxxxxxxx>
Cc: Patrick McHardy <kaber@xxxxxxxxx>
Reviewed-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Aring <aar@xxxxxxxxxxxxxx>
---
net/ipv6/addrconf.c | 203 ++++++++++++++++++++++++++++------------------------
1 file changed, 109 insertions(+), 94 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index beaad49..0ca31e1 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2333,12 +2333,110 @@ static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
}
+static int addrconf_prefix_rcv_add_addr(struct net *net,
+ struct net_device *dev,
+ const struct prefix_info *pinfo,
+ struct inet6_dev *in6_dev,
+ const struct in6_addr *addr,
+ int addr_type, u32 addr_flags,
+ bool sllao, bool tokenized,
+ __u32 valid_lft, u32 prefered_lft)
+{
+ struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
+ int create = 0, update_lft = 0;
+
+ if (!ifp && valid_lft) {
+ int max_addresses = in6_dev->cnf.max_addresses;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+ if (in6_dev->cnf.optimistic_dad &&
+ !net->ipv6.devconf_all->forwarding && sllao)
+ addr_flags |= IFA_F_OPTIMISTIC;
+#endif
+
+ /* Do not allow to create too much of autoconfigured
+ * addresses; this would be too easy way to crash kernel.
+ */
+ if (!max_addresses ||
+ ipv6_count_addresses(in6_dev) < max_addresses)
+ ifp = ipv6_add_addr(in6_dev, addr, NULL,
+ pinfo->prefix_len,
+ addr_type&IPV6_ADDR_SCOPE_MASK,
+ addr_flags, valid_lft,
+ prefered_lft);
+
+ if (IS_ERR_OR_NULL(ifp))
+ return -1;
+
+ update_lft = 0;
+ create = 1;
+ spin_lock_bh(&ifp->lock);
+ ifp->flags |= IFA_F_MANAGETEMPADDR;
+ ifp->cstamp = jiffies;
+ ifp->tokenized = tokenized;
+ spin_unlock_bh(&ifp->lock);
+ addrconf_dad_start(ifp);
+ }
+
+ if (ifp) {
+ u32 flags;
+ unsigned long now;
+ u32 stored_lft;
+
+ /* update lifetime (RFC2462 5.5.3 e) */
+ spin_lock_bh(&ifp->lock);
+ now = jiffies;
+ if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
+ stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
+ else
+ stored_lft = 0;
+ if (!update_lft && !create && stored_lft) {
+ const u32 minimum_lft = min_t(u32,
+ stored_lft, MIN_VALID_LIFETIME);
+ valid_lft = max(valid_lft, minimum_lft);
+
+ /* RFC4862 Section 5.5.3e:
+ * "Note that the preferred lifetime of the
+ * corresponding address is always reset to
+ * the Preferred Lifetime in the received
+ * Prefix Information option, regardless of
+ * whether the valid lifetime is also reset or
+ * ignored."
+ *
+ * So we should always update prefered_lft here.
+ */
+ update_lft = 1;
+ }
+
+ if (update_lft) {
+ ifp->valid_lft = valid_lft;
+ ifp->prefered_lft = prefered_lft;
+ ifp->tstamp = now;
+ flags = ifp->flags;
+ ifp->flags &= ~IFA_F_DEPRECATED;
+ spin_unlock_bh(&ifp->lock);
+
+ if (!(flags&IFA_F_TENTATIVE))
+ ipv6_ifa_notify(0, ifp);
+ } else
+ spin_unlock_bh(&ifp->lock);
+
+ manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
+ create, now);
+
+ in6_ifa_put(ifp);
+ addrconf_verify();
+ }
+
+ return 0;
+}
+
void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
{
struct prefix_info *pinfo;
__u32 valid_lft;
__u32 prefered_lft;
- int addr_type;
+ int addr_type, err;
u32 addr_flags = 0;
struct inet6_dev *in6_dev;
struct net *net = dev_net(dev);
@@ -2432,9 +2530,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
/* Try to figure out our local address for this prefix */
if (pinfo->autoconf && in6_dev->cnf.autoconf) {
- struct inet6_ifaddr *ifp;
struct in6_addr addr;
- int create = 0, update_lft = 0;
bool tokenized = false;
if (pinfo->prefix_len == 64) {
@@ -2453,106 +2549,25 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
goto ok;
} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
- in6_dev_put(in6_dev);
- return;
+ goto put;
}
goto ok;
}
net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
pinfo->prefix_len);
- in6_dev_put(in6_dev);
- return;
+ goto put;
ok:
-
- ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
-
- if (!ifp && valid_lft) {
- int max_addresses = in6_dev->cnf.max_addresses;
-
-#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
- if (in6_dev->cnf.optimistic_dad &&
- !net->ipv6.devconf_all->forwarding && sllao)
- addr_flags |= IFA_F_OPTIMISTIC;
-#endif
-
- /* Do not allow to create too much of autoconfigured
- * addresses; this would be too easy way to crash kernel.
- */
- if (!max_addresses ||
- ipv6_count_addresses(in6_dev) < max_addresses)
- ifp = ipv6_add_addr(in6_dev, &addr, NULL,
- pinfo->prefix_len,
- addr_type&IPV6_ADDR_SCOPE_MASK,
- addr_flags, valid_lft,
- prefered_lft);
-
- if (IS_ERR_OR_NULL(ifp)) {
- in6_dev_put(in6_dev);
- return;
- }
-
- update_lft = 0;
- create = 1;
- spin_lock_bh(&ifp->lock);
- ifp->flags |= IFA_F_MANAGETEMPADDR;
- ifp->cstamp = jiffies;
- ifp->tokenized = tokenized;
- spin_unlock_bh(&ifp->lock);
- addrconf_dad_start(ifp);
- }
-
- if (ifp) {
- u32 flags;
- unsigned long now;
- u32 stored_lft;
-
- /* update lifetime (RFC2462 5.5.3 e) */
- spin_lock_bh(&ifp->lock);
- now = jiffies;
- if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
- stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
- else
- stored_lft = 0;
- if (!update_lft && !create && stored_lft) {
- const u32 minimum_lft = min_t(u32,
- stored_lft, MIN_VALID_LIFETIME);
- valid_lft = max(valid_lft, minimum_lft);
-
- /* RFC4862 Section 5.5.3e:
- * "Note that the preferred lifetime of the
- * corresponding address is always reset to
- * the Preferred Lifetime in the received
- * Prefix Information option, regardless of
- * whether the valid lifetime is also reset or
- * ignored."
- *
- * So we should always update prefered_lft here.
- */
- update_lft = 1;
- }
-
- if (update_lft) {
- ifp->valid_lft = valid_lft;
- ifp->prefered_lft = prefered_lft;
- ifp->tstamp = now;
- flags = ifp->flags;
- ifp->flags &= ~IFA_F_DEPRECATED;
- spin_unlock_bh(&ifp->lock);
-
- if (!(flags&IFA_F_TENTATIVE))
- ipv6_ifa_notify(0, ifp);
- } else
- spin_unlock_bh(&ifp->lock);
-
- manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
- create, now);
-
- in6_ifa_put(ifp);
- addrconf_verify();
- }
+ err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
+ &addr, addr_type,
+ addr_flags, sllao,
+ tokenized, valid_lft,
+ prefered_lft);
+ if (err)
+ goto put;
}
inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
+put:
in6_dev_put(in6_dev);
}
--
2.8.3
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