[RFC alternate] ipv6: addrconf: clean up device type handling
From: David Lamparter <hidden>
Date: 2014-07-30 15:59:04
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
This realigns addrconf support for the various lower-layer device types, and removes a little bit of duplicate code. For GRE devices, this includes a semantic change in that there is now a ff00::/8 route installed on address autogeneration. This was previously missing and broke any kind of IPv6 multicast - unless another address was configured from userspace (which then added the missing ff00::/8). Fixes: aee80b54b235 (ipv6: generate link local address for GRE tunnel) Signed-off-by: David Lamparter <redacted> Cc: Hannes Frederic Sowa <redacted> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Jiri Pirko <jiri@resnulli.us> --- This is an alternate version, yanking the switch() down and removing dev_config/gre_config duplication. I have no idea what rationale is behind prefix_route - the result is a fe80::/64 route, but no address, which is not a functioning configuration. Jiri, you touched this just a few weeks ago, can you comment? (The "XXX: why is GRE special?") net/ipv6/addrconf.c | 87 +++++++++++++++++++++++------------------------------ 1 file changed, 37 insertions(+), 50 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 0b239fc..45746f7 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c@@ -2756,31 +2756,6 @@ static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) } } -static void addrconf_dev_config(struct net_device *dev) -{ - struct inet6_dev *idev; - - ASSERT_RTNL(); - - if ((dev->type != ARPHRD_ETHER) && - (dev->type != ARPHRD_FDDI) && - (dev->type != ARPHRD_ARCNET) && - (dev->type != ARPHRD_INFINIBAND) && - (dev->type != ARPHRD_IEEE802154) && - (dev->type != ARPHRD_IEEE1394) && - (dev->type != ARPHRD_TUNNEL6) && - (dev->type != ARPHRD_6LOWPAN)) { - /* Alas, we support only Ethernet autoconfiguration. */ - return; - } - - idev = addrconf_add_dev(dev); - if (IS_ERR(idev)) - return; - - addrconf_addr_gen(idev, false); -} - #if IS_ENABLED(CONFIG_IPV6_SIT) static void addrconf_sit_config(struct net_device *dev) {
@@ -2811,21 +2786,51 @@ static void addrconf_sit_config(struct net_device *dev) } #endif -#if IS_ENABLED(CONFIG_NET_IPGRE) -static void addrconf_gre_config(struct net_device *dev) +static void addrconf_dev_config(struct net_device *dev) { struct inet6_dev *idev; + bool prefix_route; ASSERT_RTNL(); - if ((idev = ipv6_find_idev(dev)) == NULL) { - pr_debug("%s: add_dev failed\n", __func__); + switch (dev->type) { + case ARPHRD_LOOPBACK: + init_loopback(dev); + return; + + case ARPHRD_ETHER: + case ARPHRD_FDDI: + case ARPHRD_ARCNET: + case ARPHRD_INFINIBAND: + case ARPHRD_IEEE802154: + case ARPHRD_IEEE1394: + case ARPHRD_TUNNEL6: + case ARPHRD_6LOWPAN: + prefix_route = false; + break; + +#if IS_ENABLED(CONFIG_NET_IPGRE) + case ARPHRD_IPGRE: + /* XXX: why is GRE special? */ + prefix_route = true; + break; +#endif +#if IS_ENABLED(CONFIG_IPV6_SIT) + case ARPHRD_SIT: + addrconf_sit_config(dev); + return; +#endif + default: + /* No support autoconfiguration on this type */ return; } - addrconf_addr_gen(idev, true); + idev = addrconf_add_dev(dev); + if (IS_ERR(idev)) + return; + + addrconf_addr_gen(idev, prefix_route); } -#endif static int addrconf_notify(struct notifier_block *this, unsigned long event, void *ptr)
@@ -2883,25 +2888,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, run_pending = 1; } - switch (dev->type) { -#if IS_ENABLED(CONFIG_IPV6_SIT) - case ARPHRD_SIT: - addrconf_sit_config(dev); - break; -#endif -#if IS_ENABLED(CONFIG_NET_IPGRE) - case ARPHRD_IPGRE: - addrconf_gre_config(dev); - break; -#endif - case ARPHRD_LOOPBACK: - init_loopback(dev); - break; - - default: - addrconf_dev_config(dev); - break; - } + addrconf_dev_config(dev); if (!IS_ERR_OR_NULL(idev)) { if (run_pending)
--
1.8.5.5