linux/net
Brian Haley a1ed05263b IPv6: preferred lifetime of address not getting updated
There's a bug in addrconf_prefix_rcv() where it won't update the
preferred lifetime of an IPv6 address if the current valid lifetime
of the address is less than 2 hours (the minimum value in the RA).

For example, If I send a router advertisement with a prefix that
has valid lifetime = preferred lifetime = 2 hours we'll build
this address:

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic
       valid_lft 7175sec preferred_lft 7175sec

If I then send the same prefix with valid lifetime = preferred
lifetime = 0 it will be ignored since the minimum valid lifetime
is 2 hours:

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic
       valid_lft 7161sec preferred_lft 7161sec

But according to RFC 4862 we should always reset the preferred lifetime
even if the valid lifetime is invalid, which would cause the address
to immediately get deprecated.  So with this patch we'd see this:

5: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:1890:1109:a20:21f:29ff:fe5a:ef04/64 scope global deprecated dynamic
       valid_lft 7163sec preferred_lft 0sec

The comment winds-up being 5x the size of the code to fix the problem.

Update the preferred lifetime of IPv6 addresses derived from a prefix
info option in a router advertisement even if the valid lifetime in
the option is invalid, as specified in RFC 4862 Section 5.5.3e.  Fixes
an issue where an address will not immediately become deprecated.
Reported by Jens Rosenboom.

Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-07-03 19:10:13 -07:00
..
9p net/9p: Fix crash due to bad mount parameters. 2009-07-02 13:17:01 -07:00
802 net: remove COMPAT_NET_DEV_OPS 2009-05-25 01:53:53 -07:00
8021q 8021q: Vlan driver should use rcu_barrier() on unload instead of syncronize_net() 2009-06-10 01:11:22 -07:00
appletalk net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
atm atm: sk_wmem_alloc initial value is one 2009-06-18 00:29:12 -07:00
ax25 net: Move rx skb_orphan call to where needed 2009-06-23 16:36:25 -07:00
bluetooth net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
bridge bridge: Use rcu_barrier() instead of syncronize_net() on unload. 2009-06-26 13:51:32 -07:00
can can: af_can.c use rcu_barrier() on module unload. 2009-06-10 01:11:24 -07:00
core gro: Flush GRO packets in napi_disable_pending path 2009-06-26 19:27:04 -07:00
dcb DCB: fix kfree(skb) 2009-01-04 17:29:21 -08:00
dccp ipv6: Use correct data types for ICMPv6 type and code 2009-06-23 04:31:07 -07:00
decnet decnet: Use rcu_barrier() on module unload. 2009-06-26 13:51:27 -07:00
dsa net: convert unicast addr list 2009-05-29 22:12:32 -07:00
econet net: sk_wmem_alloc has initial value of one, not zero 2009-06-17 04:31:25 -07:00
ethernet net: remove COMPAT_NET_DEV_OPS 2009-05-25 01:53:53 -07:00
ieee802154 nl802154: add module license and description 2009-06-29 18:20:28 +04:00
ipv4 xfrm4: fix the ports decode of sctp protocol 2009-07-03 19:10:06 -07:00
ipv6 IPv6: preferred lifetime of address not getting updated 2009-07-03 19:10:13 -07:00
ipx net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
irda net: Move rx skb_orphan call to where needed 2009-06-23 16:36:25 -07:00
iucv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-06-22 11:57:09 -07:00
key net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
lapb
llc net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
mac80211 mac80211: Use rcu_barrier() on unload. 2009-06-26 13:51:36 -07:00
netfilter netfilter: xtables: conntrack match revision 2 2009-06-29 14:31:46 +02:00
netlabel netlabel: Use genl_register_family_with_ops() 2009-05-21 16:50:24 -07:00
netlink net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
netrom net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
packet net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
phonet Phonet: generate Netlink RTM_DELADDR when destroying a device 2009-06-25 02:58:16 -07:00
rds Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-05-18 21:08:20 -07:00
rfkill rfkill: export persistent attribute in sysfs 2009-06-19 11:50:18 -04:00
rose net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
rxrpc RxRPC: Don't attempt to reuse aborted connections 2009-06-16 21:20:14 -07:00
sched net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
sctp sctp: xmit sctp packet always return no route error 2009-06-29 19:41:53 -07:00
sunrpc sunrpc: Use rcu_barrier() on unload. 2009-06-26 13:51:34 -07:00
tipc tipc: Use genl_register_family_with_ops() 2009-05-21 16:50:23 -07:00
unix net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
wanrouter wanrouter: fix sparse warnings: context imbalance 2009-02-26 23:13:36 -08:00
wimax wimax: fix warning caused by not checking retval of rfkill_set_hw_state() 2009-06-11 11:12:48 -07:00
wireless cfg80211: validate station settings 2009-06-19 11:50:24 -04:00
x25 net: correct off-by-one write allocations reports 2009-06-18 00:29:12 -07:00
xfrm xfrm: use xfrm_addr_cmp() instead of compare addresses directly 2009-06-29 19:41:46 -07:00
compat.c net: socket infrastructure for SO_TIMESTAMPING 2009-02-15 22:43:35 -08:00
Kconfig net: add IEEE 802.15.4 socket family implementation 2009-06-09 05:25:32 -07:00
Makefile net: add IEEE 802.15.4 socket family implementation 2009-06-09 05:25:32 -07:00
nonet.c
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-04-06 18:05:43 -07:00
sysctl_net.c net: sysctl_net - use net_eq to compare nets 2009-03-16 16:23:30 +01:00
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