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-rw-r--r--include/net/if_inet6.h1
-rw-r--r--include/uapi/linux/if_link.h6
-rw-r--r--net/ipv6/addrconf.c56
3 files changed, 45 insertions, 18 deletions
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index b4956a5fcc3f..d07b1a64b4e7 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -205,6 +205,7 @@ struct inet6_dev {
struct timer_list rs_timer;
__u8 rs_probes;
+ __u8 addr_gen_mode;
unsigned long tstamp; /* ipv6InterfaceTable update timestamp */
struct rcu_head rcu;
};
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index b38534895db5..ff957604a721 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -204,11 +204,17 @@ enum {
IFLA_INET6_CACHEINFO, /* time values and max reasm size */
IFLA_INET6_ICMP6STATS, /* statistics (icmpv6) */
IFLA_INET6_TOKEN, /* device token */
+ IFLA_INET6_ADDR_GEN_MODE, /* implicit address generator mode */
__IFLA_INET6_MAX
};
#define IFLA_INET6_MAX (__IFLA_INET6_MAX - 1)
+enum in6_addr_gen_mode {
+ IN6_ADDR_GEN_MODE_EUI64,
+ IN6_ADDR_GEN_MODE_NONE,
+};
+
enum {
BRIDGE_MODE_UNSPEC,
BRIDGE_MODE_HAIRPIN,
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 358edd2272ac..4c03c2843094 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2730,9 +2730,25 @@ static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr
}
}
+static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
+{
+ if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
+ struct in6_addr addr;
+
+ ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
+ /* addrconf_add_linklocal also adds a prefix_route and we
+ * only need to care about prefix routes if ipv6_generate_eui64
+ * couldn't generate one.
+ */
+ if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
+ addrconf_add_linklocal(idev, &addr);
+ else if (prefix_route)
+ addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+ }
+}
+
static void addrconf_dev_config(struct net_device *dev)
{
- struct in6_addr addr;
struct inet6_dev *idev;
ASSERT_RTNL();
@@ -2753,11 +2769,7 @@ static void addrconf_dev_config(struct net_device *dev)
if (IS_ERR(idev))
return;
- memset(&addr, 0, sizeof(struct in6_addr));
- addr.s6_addr32[0] = htonl(0xFE800000);
-
- if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
- addrconf_add_linklocal(idev, &addr);
+ addrconf_addr_gen(idev, false);
}
#if IS_ENABLED(CONFIG_IPV6_SIT)
@@ -2779,11 +2791,7 @@ static void addrconf_sit_config(struct net_device *dev)
}
if (dev->priv_flags & IFF_ISATAP) {
- struct in6_addr addr;
-
- ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
- if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
- addrconf_add_linklocal(idev, &addr);
+ addrconf_addr_gen(idev, false);
return;
}
@@ -2798,7 +2806,6 @@ static void addrconf_sit_config(struct net_device *dev)
static void addrconf_gre_config(struct net_device *dev)
{
struct inet6_dev *idev;
- struct in6_addr addr;
ASSERT_RTNL();
@@ -2807,11 +2814,7 @@ static void addrconf_gre_config(struct net_device *dev)
return;
}
- ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
- if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
- addrconf_add_linklocal(idev, &addr);
- else
- addrconf_prefix_route(&addr, 64, dev, 0, 0);
+ addrconf_addr_gen(idev, true);
}
#endif
@@ -4423,6 +4426,10 @@ static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
if (nla == NULL)
goto nla_put_failure;
+
+ if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
+ goto nla_put_failure;
+
read_lock_bh(&idev->lock);
memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
read_unlock_bh(&idev->lock);
@@ -4527,8 +4534,21 @@ static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
BUG();
- if (tb[IFLA_INET6_TOKEN])
+ if (tb[IFLA_INET6_TOKEN]) {
err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
+ if (err)
+ return err;
+ }
+
+ if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
+ u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
+
+ if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
+ mode != IN6_ADDR_GEN_MODE_NONE)
+ return -EINVAL;
+ idev->addr_gen_mode = mode;
+ err = 0;
+ }
return err;
}