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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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864150dfa3
When a listener registers to the FIB notification chain it receives a
dump of the FIB entries and rules from existing address families by
invoking their dump operations.
While we call into these modules we need to make sure they aren't
removed. Do that by increasing their reference count before invoking
their dump operations and decrease it afterwards.
Fixes: 04b1d4e50e ("net: core: Make the FIB notification chain generic")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#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 <linux/export.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/ipv6.h>
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#include <net/ip6_fib.h>
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int call_fib6_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_INET6;
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return call_fib_notifier(nb, net, event_type, info);
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}
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int call_fib6_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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info->family = AF_INET6;
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return call_fib_notifiers(net, event_type, info);
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}
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static unsigned int fib6_seq_read(struct net *net)
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{
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return fib6_tables_seq_read(net) + fib6_rules_seq_read(net);
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}
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static int fib6_dump(struct net *net, struct notifier_block *nb)
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{
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int err;
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err = fib6_rules_dump(net, nb);
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if (err)
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return err;
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return fib6_tables_dump(net, nb);
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}
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static const struct fib_notifier_ops fib6_notifier_ops_template = {
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.family = AF_INET6,
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.fib_seq_read = fib6_seq_read,
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.fib_dump = fib6_dump,
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.owner = THIS_MODULE,
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};
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int __net_init fib6_notifier_init(struct net *net)
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{
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struct fib_notifier_ops *ops;
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ops = fib_notifier_ops_register(&fib6_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->ipv6.notifier_ops = ops;
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return 0;
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}
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void __net_exit fib6_notifier_exit(struct net *net)
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{
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fib_notifier_ops_unregister(net->ipv6.notifier_ops);
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}
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