kernel/linux.git/net/ipv6/addrconf_core.c, branch linux-4.13.y

Ipvlan should return an error when an address is already in use.

2017-06-09T16:26:07+00:00

The ipvlan code already knows how to detect when a duplicate address is about to be assigned to an ipvlan device. However, that failure is not propogated outward and leads to a silent failure. Introduce a validation step at ip address creation time and allow device drivers to register to validate the incoming ip addresses. The ipvlan code is the first consumer. If it detects an address in use, we can return an error to the user before beginning to commit the new ifa in the networking code. This can be especially useful if it is necessary to provision many ipvlans in containers. The provisioning software (or operator) can use this to detect situations where an ip address is unexpectedly in use. Signed-off-by: Krister Johansen Signed-off-by: David S. Miller

ipv6: change ipv6_stub_impl.ipv6_dst_lookup to take net argument

2015-07-31T22:21:30+00:00

This patch adds net argument to ipv6_stub_impl.ipv6_dst_lookup for use cases where sk is not available (like mpls). sk appears to be needed to get the namespace 'net' and is optional otherwise. This patch series changes ipv6_stub_impl.ipv6_dst_lookup to take net argument. sk remains optional. All callers of ipv6_stub_impl.ipv6_dst_lookup have been modified to pass net. I have modified them to use already available 'net' in the scope of the call. I can change them to sock_net(sk) to avoid any unintended change in behaviour if sock namespace is different. They dont seem to be from code inspection. Signed-off-by: Roopa Prabhu Signed-off-by: David S. Miller

ipv6: fix possible use after free of dev stats

2015-06-08T19:12:45+00:00

The memory pointed to by idev->stats.icmpv6msgdev, idev->stats.icmpv6dev and idev->stats.ipv6 can each be used in an RCU read context without taking a reference on idev. For example, through IP6_*_STATS_* calls in ip6_rcv. These memory blocks are freed without waiting for an RCU grace period to elapse. This could lead to the memory being written to after it has been freed. Fix this by using call_rcu to free the memory used for stats, as well as idev after an RCU grace period has elapsed. Signed-off-by: Robert Shearman Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller

ipv6: coding style: comparison for inequality with NULL

2015-03-31T17:51:54+00:00

The ipv6 code uses a mixture of coding styles. In some instances check for NULL pointer is done as x != NULL and sometimes as x. x is preferred according to checkpatch and this patch makes the code consistent by adopting the latter form. No changes detected by objdiff. Signed-off-by: Ian Morris Signed-off-by: David S. Miller

ipv6: remove rt6i_genid

2014-09-30T18:00:48+00:00

Eric Dumazet noticed that all no-nonexthop or no-gateway routes which are already marked DST_HOST (e.g. input routes routes) will always be invalidated during sk_dst_check. Thus per-socket dst caching absolutely had no effect and early demuxing had no effect. Thus this patch removes rt6i_genid: fn_sernum already gets modified during add operations, so we only must ensure we mutate fn_sernum during ipv6 address remove operations. This is a fairly cost extensive operations, but address removal should not happen that often. Also our mtu update functions do the same and we heard no complains so far. xfrm policy changes also cause a call into fib6_flush_trees. Also plug a hole in rt6_info (no cacheline changes). I verified via tracing that this change has effect. Cc: Eric Dumazet Cc: YOSHIFUJI Hideaki Cc: Vlad Yasevich Cc: Nicolas Dichtel Cc: Martin Lau Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller

net: clean up snmp stats code

2014-05-07T20:06:05+00:00

commit 8f0ea0fe3a036a47767f9c80e (snmp: reduce percpu needs by 50%) reduced snmp array size to 1, so technically it doesn't have to be an array any more. What's more, after the following commit: commit 933393f58fef9963eac61db8093689544e29a600 Date: Thu Dec 22 11:58:51 2011 -0600 percpu: Remove irqsafe_cpu_xxx variants We simply say that regular this_cpu use must be safe regardless of preemption and interrupt state. That has no material change for x86 and s390 implementations of this_cpu operations. However, arches that do not provide their own implementation for this_cpu operations will now get code generated that disables interrupts instead of preemption. probably no arch wants to have SNMP_ARRAY_SZ == 2. At least after almost 3 years, no one complains. So, just convert the array to a single pointer and remove snmp_mib_init() and snmp_mib_free() as well. Cc: Christoph Lameter Cc: Eric Dumazet Cc: David S. Miller Signed-off-by: Cong Wang Signed-off-by: David S. Miller

ipv6: move in6_dev_finish_destroy() into core kernel

2013-09-01T02:30:00+00:00

in6_dev_put() will be needed by vxlan module, so is in6_dev_finish_destroy(). Cc: David S. Miller Signed-off-by: Cong Wang Signed-off-by: David S. Miller

ipv6: export in6addr_loopback to modules

2013-09-01T02:30:00+00:00

It is needed by vxlan module. Noticed by Mike. Cc: Mike Rapoport Signed-off-by: Cong Wang Signed-off-by: David S. Miller

ipv6: export a stub for IPv6 symbols used by vxlan

2013-09-01T02:30:00+00:00

In case IPv6 is compiled as a module, introduce a stub for ipv6_sock_mc_join and ipv6_sock_mc_drop etc.. It will be used by vxlan module. Suggested by Ben. This is an ugly but easy solution for now. Cc: Ben Hutchings Cc: Stephen Hemminger Cc: David S. Miller Signed-off-by: Cong Wang Signed-off-by: David S. Miller

ipv6: add include file to suppress sparse warnings

2013-06-25T09:44:05+00:00

commit f88c91ddba95 ("ipv6: statically link register_inet6addr_notifier()" added following sparse warnings : net/ipv6/addrconf_core.c:83:5: warning: symbol 'register_inet6addr_notifier' was not declared. Should it be static? net/ipv6/addrconf_core.c:89:5: warning: symbol 'unregister_inet6addr_notifier' was not declared. Should it be static? net/ipv6/addrconf_core.c:95:5: warning: symbol 'inet6addr_notifier_call_chain' was not declared. Should it be static? Signed-off-by: Eric Dumazet Cc: Cong Wang Signed-off-by: David S. Miller