04b1d4e50e
The FIB notification chain is currently soley used by IPv4 code.
However, we're going to introduce IPv6 FIB offload support, which
requires these notification as well.
As explained in commit c3852ef7f2 ("ipv4: fib: Replay events when
registering FIB notifier"), upon registration to the chain, the callee
receives a full dump of the FIB tables and rules by traversing all the
net namespaces. The integrity of the dump is ensured by a per-namespace
sequence counter that is incremented whenever a change to the tables or
rules occurs.
In order to allow more address families to use the chain, each family is
expected to register its fib_notifier_ops in its pernet init. These
operations allow the common code to read the family's sequence counter
as well as dump its tables and rules in the given net namespace.
Additionally, a 'family' parameter is added to sent notifications, so
that listeners could distinguish between the different families.
Implement the common code that allows listeners to register to the chain
and for address families to register their fib_notifier_ops. Subsequent
patches will implement these operations in IPv6.
In the future, ipmr and ip6mr will be extended to provide these
notifications as well.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
#include <linux/rtnetlink.h>
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#include <linux/notifier.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <net/net_namespace.h>
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#include <net/fib_notifier.h>
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#include <net/netns/ipv4.h>
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#include <net/ip_fib.h>
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int call_fib4_notifier(struct notifier_block *nb, struct net *net,
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enum fib_event_type event_type,
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struct fib_notifier_info *info)
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{
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info->family = AF_INET;
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return call_fib_notifier(nb, net, event_type, info);
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}
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int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
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struct fib_notifier_info *info)
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{
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ASSERT_RTNL();
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info->family = AF_INET;
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net->ipv4.fib_seq++;
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return call_fib_notifiers(net, event_type, info);
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}
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static unsigned int fib4_seq_read(struct net *net)
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{
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ASSERT_RTNL();
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return net->ipv4.fib_seq;
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}
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static int fib4_dump(struct net *net, struct notifier_block *nb)
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{
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fib_rules_notify(net, nb);
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fib_notify(net, nb);
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return 0;
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}
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static const struct fib_notifier_ops fib4_notifier_ops_template = {
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.family = AF_INET,
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.fib_seq_read = fib4_seq_read,
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.fib_dump = fib4_dump,
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};
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int __net_init fib4_notifier_init(struct net *net)
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{
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struct fib_notifier_ops *ops;
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net->ipv4.fib_seq = 0;
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ops = fib_notifier_ops_register(&fib4_notifier_ops_template, net);
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if (IS_ERR(ops))
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return PTR_ERR(ops);
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net->ipv4.notifier_ops = ops;
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return 0;
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}
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void __net_exit fib4_notifier_exit(struct net *net)
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{
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fib_notifier_ops_unregister(net->ipv4.notifier_ops);
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}
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